RMRDGHPF–. A Manual of botany : being an introduction to the study of the structure, physiology, and classification of plants . Botany. Fig. 510. Pig. 511. embryonic body, whence the stem of the Pern arises (fig. 511 /). The life of the sporangiferous plant is indefinite, as seen in Tree Ferns, while the prothallus is of very short duration. Thus in Ferns the spores contained in the sporangium form the prothallus without impregnation, while this latter process is necessary for the development of the germ, which gives rise to the leafy sporangiferous Fig. 507. Cellular prothallium (exothallluin) of a Pe
RF2T5GKFJ–Hemitrichia clavata, a slime mold from Finland, no common English name
RMRH8P3P–. Botany of the living plant. Botany; Plants. 512 BOTANY OF THE LIVING PLANT contributed largely to the organic remains preserved as Coal. Isoetes appears as the nearest living ally of these fossil plants. The Lycopodiales are divided into two series, the Eligulatae, in which a single sporangium is borne in or near to the axil of each leaf of the fertile cone, but without any ligule. Here the sporangia and spores are all alike, the plants being homosporous. The Eligulatae include the gen- era Lycopodium and Phyl- loglossum. But Selaginella and Isoetes are included in the Ligulatae, in which th
RF2T5GKFY–Hemitrichia clavata, a slime mold from Finland, no common English name
RMRDFBG9–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Fig. 228.—Alsophila Cooperi. A, section of the stipe, Xi^; B, cross-section of leaflet, showing the sori, X20; C, open sporangium. The Cyatheace^ These are all Ferns of large size, some of them Tree-Ferns, ID metres or more in height. They occur in the tropics of both hemispheres, and some of them, e. g., Dicksonia antarctica, are also found in the extra-tropical regions of the southern hemisphere. They correspond so closely in all respects with the typical Polypodiaceae that, except for the s
RF2T5GKFA–Hemitrichia clavata, a slime mold from Finland, no common English name
RMRD2HJ1–. Elementary botany. Botany. 124 MORPHOLOGY. ordinary threads of the mycelium. Some of the threads should be mounted in fresh water. Search for some of those which. Fig. 134- Sporangia of saprolegnia, one showing the escape of the nidia. zoogo- show that the protoplasm is divided up into a great number of small areas, as shown in fig. 134. With the low power we should watch some of the older ap- pearing ones, and if after a few minutes they do not open, other preparations should be made. 282. Zoogonidia of saprolegnia.—The sporangium opens at. Please note that these images are extracted from s
RF2WFD8K4–Tubifera ferruginosa, known as raspberry slime mold
RMRDXEYP–. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 58o FILICALES / ( of the sporangium to the receptacle, and that the distal part of the annulus is directed obliquely towards its apex. This being the case for all the sporangia, the free action of the annulus on dehiscence is assured for each individual sporangium; this may be compared with No. 95 of Hym. dilatatum. The stomium in Tr. radicans is of very simple construction : in the last of the drawings it is shown in surface view, with the slit of dehiscence gaping between the two cells. Comparing th
RF2PC6TRM–Trichia decipiens, a slime mold of the family Trichiaceae, no common English name
RMRDWA26–. Botany for high schools and colleges. Botany. FILIGES. 375 boine upon slender pedicels. Morphologically they are trichomes, â whicli undergo a special modification. Each sporangium is at first a two-celled trichome ; the lower cell of whicli develops into the pedicel, while the other becomes divided by partitions parallel to its surface into outer cells, which develop into the sporangial wall, and an inner. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfe
RF2M8BEXB–Trichia decipiens, a slime mold of the family Trichiaceae, no common English name
RMRT0FWJ–. Carnegie Institution of Washington publication. THE OLDER Sl'OROl'HYTE 205 top of which is expanded so that it overarches the synangia. This ridge in section appears T-shape. Whether this growth of leaf tissue between the synangia in Dana-a is to be considered as an indusium may be questioned. It appears to be very similar in structure to the oblong cavity or fovea, within which is sunk the not very dissimilar synangium of Isoetes (fig. 189, B). THE SPORANGIUM OF THE MARATTIAC 1 I In Angiopterts and Archangiopteris there are formed separate sporangia not very unlike those found in Botrychium
RF2M8B8EN–Metatrichia vesparium, commonly known as wasp nest slime mold, microscope image
RMRFA3JN–. Catalogue of the fossil plants of the Glossopteris flora in the Department of geology. Paleobotany -- Carboniferous; Paleobotany -- Catalogs and collections; Plants, Fossil -- Catalogs and collections. 42 GLOSSOrTElUS. These organs are sac-like structures, and dehisced longitudinally. Their contents have not, however, heen recognised, but from I Ills ill mill (its m. Fig. 13.—Sporangium-like organs of Glossoptcris Browniana, Brong. V. 7202 and V. 7211. x 35. a number of considerations there is little doubt that they were of the nature of spores, and the sacs themselves sporangia.. Please not
RF2NK08DM–Tubifera ferruginosa, known as raspberry slime mold
RMRDXG7M–. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. SPORE-PRODUCING MEMBERS 321 details in them restricts the comparison to the basis of mature structure. On this footing it appears that the type of sporangium characteristic of the sub-genus Urostachya, and showing special resemblance to that of Lycopodium Phlegmaria, dates back at least to the calciferous sandstone, for it is seen in Lycopodites Stockii (compare Fig. 147). Sporangia apparently of the same type have been recognised also in other early fossils referred to Lycopodites, but their small si
RF2P39K3W–Tubifera ferruginosa, known as raspberry slime mold
RMRMMG4K–. Annals of applied biology. Biology, Economic; Biochemistry. fl. VVORMALD 97 making any definite directive movement. In another instance two zoospores appeared to be attached by their cilia for a dehcate fibril was seen to be connecting them; by their frantic efforts this was soon broken and they disappeared in opposite directions. Frequently fragments of protoplasm remained just outside the mouth of the sporangium after the zoospores had swum away; these became rounded oH and showed no signs of movement. The zoospores after swimming about for some time lost their motility, assumed a spherica
RF2HYG92P–Trichia botrytis, a slime mold or mould of the family Trichiaceae, no common English name
RMRH8WNP–. Botany; principles and problems. Botany. 332 BOTANY: PRINCIPLES AND PROBLEMS rupturing the sporangium wall and forcibly ejecting the spores. The shape and position of the sorus and indusium, as well as the type of annulus, vary greatly among the different groups of ferns and serve as useful characters by which to distinguish genera and families. The spores germinate into a thin, small, thallus-like gameto- phyte or prothaUus (Fig. 202) which possesses chlorophyll and is. Fig. 205.—Graphic representation of the life-history of a fern. 1, the fern plant or sporophyte, bearing sori, or clusters
RF2HD2JEP–Hemitrichia clavata, a slime mold of the family Trichiidae, no common English name
RMRE2N72–. Elementary botany. Botany. 182 MOKPHOLOGY. 391. Zoogonidia of saprolegnia,—The sporangium opens at. Fig. 106. Branch of saprolegnia showing oogonia with oospores, eggs matured parthenogenetically. the end, and the zoogonidia swirl out and swim around for a short time, when they come to rest. With a good magnifying. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Atkinson, George Francis, 1854-1918. New York : H. Holt
RF2HYG94K–Trichia botrytis, a slime mold or mould of the family Trichiaceae, no common English name
RMREFC6N–. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. CHAPTER V.—COMPARATIVE REVIEW.—PERONOSPOREAE. 137 and especially of genera, may be taken chiefly from the gonidial formations, while the few species which have no gonidia are not easily classified. The main features in the formation of gonidia in the genera and subgenera of the Peronosporeae are as follows :— Fythium. A persistent cell, usually the terminal cell of a branch, is delimited by a transverse wall and becomes a spore-mother-cell (sporangium). The gelatinously thick
RF2H9Y1H8–Hemitrichia clavata, a slime mold of the family Trichiidae, no common English name
RMREE411–. Comparative morphology of Fungi. Fungi. Fig. 60.—Cunninghamella echinulata. Development of sporangiophores. (X740; after Moreau, 1914.) have two to three hyaline processes from each of which up to 20 hairs arise. With liberal food, on swollen tips of vertical hyphae or eventually on the short secondary branches, the spores arise, not endogenously by cleavage, but exogenously by budding. Spore formation is ontogeneti- cally retarded and is transferred from the interior of the sporangium to its upper surfaces. These exogenous spores, in contrast to the endogenous, are longitudinally striate an
RF2HBT2PA–Hemitrichia clavata, a slime mold of the family Trichiidae, no common English name
RMRDWG4P–. Nature and development of plants. Botany. IJEVELOPMENT OF PLANTS 219 ing tubular threads without partitions but containing numerous nuclei and thus resembling Vaucheria save for the absence of chloroplasts (Fig. 130). The sporangia are also formed by the cutting off of the tip of one of the branches by a transverse wall. The contents of a sporangium, however, generally breaks up into a very large number of biciliate zoospores (Fig. 130, C). In the species that cause so much damage to fish, the spores come to rest upon the fish and form tubular outgrowths that readily penetrate the tissues of
RF2H9Y1FW–Hemitrichia clavata, a slime mold of the family Trichiidae, no common English name
RMRDWFDP–. Elementary botany. Botany. QUILLWORTS. I97 398. Sporangia of isoetes.—If we pull off some of the leaves of the plant we see that they are somewhat spoon-shaped as in fig. 249. In the inner surface of the expanded base we note a circular depression which seems to be of a different text-. Kig. 249. Base of leaf of isoetes, showing sporangium with macrospores. (isoetes en- gelmannii.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origina
RF2HBT30T–Trichia decipiens, a slime mold of the family Trichiaceae, no common English name
RMRDYH0P–. An introduction to vegetable physiology. Plant physiology. 432 VEGETABLE PHYSIOLOGY structure known as the seed. It becomes detached from the parent sporophyte and disseminated in various ways. In the Angiosperms the formation of the seed is in the main similar to the process described, but it has certain peculiar features. The embryo-sac or megaspore has the same structure as in the Gymnosperms and remains enclosed in the sporangium or ovule. The development of the prothallium is different. The megaspore has a single nucleus as in other cases. When germination begins. Fig. 178.—Ovule of Pin
RF2HBT315–Trichia decipiens, a slime mold of the family Trichiaceae, no common English name
RMRDWD96–. Botany, with agricultural applications. Botany. 338 THALLOPHYTES structures, varying in shape according to the species, the remain- ing protoplasm of the Plasmodium passes until they are filled. Often nearly the entire Plasmodium is used in forming and filling. Fig. 290. — Various Myxomycetes, showing various types of sporangia. The large sporangium at the left and the third one from the left, below, have shed the spores, and the capillitium, the lace-like framework of the sporangium, is plainly visible. The larger ones are larger than natural size, the smaller ones are reduced. From Kerner.
RF2H9Y3MP–Trichia decipiens, a slime mold from Finland with no common English name
RMRE3B5A–. Practical botany. Botany. Fig. 176. Black mold Below is a slightly magnified illustration of plants, one of which has given'rise to the other by means of a runner, or stolon. Descending are the rliizoids and as- cending are the aerial branches, upon the tips of which spores are borne within sporangia. Above and at the right a more highly magnified sporangium is shown. Its wall (w) incloses many spores (s), through which may be seen the columella (c), which is the swollen tip of the stalk upon which the sporangium is borne. This wall may be broken away, so as to leave some of the spores lying
RF2HBN3CH–Badhamia panicea, a species of slime mold belonging to the family Physaraceae
RMRE1R5A–. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 219 ing tubular threads without partitions but containing numerous nuclei and thus resembling Vaucheria save for the absence of chloroplasts (Fig. 130). The sporangia are also formed by the cutting oif of the tip of one of the branches by a transverse wall. The contents of a sporangium, however, generally breaks up into a very large number of biciliate zoospores (Fig. 130, C). In the species that cause so much damage to fish, the spores come to rest upon the fish and form tubular outgrowths that readily penetrate the tissues of
RF2HBN3CX–Badhamia panicea, a species of slime mold belonging to the family Physaraceae
RMRDGFCD–. A textbook of botany for colleges and universities ... Botany. REPRODUCTION AND DISPERSAL 813 turgor, whereupon the escaping water tears loose the sporangium and expels it with the enclosed spores for some distance. In a somewhat similar fashion are expelled the conidia of Entomophthora and the ascospores of Ascoholus and of Peziza repanda. In the ergot fungus (Claviceps) a sweetish substance, known as honey dew, is se- creted as the conidia ripen, and insects visiting the fungus for the honey dew scatter the spores. In the stinkhorn fungus {Phallus impudicus) the spore-bearing portion deliq
RF2ANJA2T–Trichia botrytis, a slime mold of the family Trichiaceae, specimen from Finland
RMRDFCHA–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. VII PTERIDOPHYTA—FILICINEM—OPHIOGLOSSACE^ 255 arate an inner archesporium from the outer cells, destined to form the wall of the sporangium. Between the young spo- rangia the cells form sterile septa. The cell-groups which form archesporia, and those which develop into sterile septa, are sister-cell groups. All of the sporogenous tissue cannot be traced back to the primary archesporial cell, as later secondary sporogenous tissue may be formed by further periclinal divisions in the outer cells
RF2ANJA40–Trichia botrytis, a slime mold of the family Trichiaceae, specimen from Finland
RMRPXKNR–. Text-book of botany, morphological and physiological. Botany. EQUISETINEM. 403 portion of each protuberance remains slender, and forms the pedicel of the hex- agonal peltate scale. The outer surface of these scales is tangential to the axis of the spike; on its inner side, facing the axis, arise the sporangia, five or ten in number on each scale. In the early stages of development each single sporangium has the appearance of a small blunt multicellular wart; [an axial row of the cells grows more vigorously than the rest, and it is the terminal hypodermal cell of this row which constitutes th
RF2ANJA2M–Trichia botrytis, a slime mold of the family Trichiaceae, specimen from Finland
RMRE3DA6–. Introduction to cryptogamic botany. Cryptogams. INTRODUCTION TO CETPTOGAMIC BOTANY. , 489 sporangium, but the whole aperture is closed by a diaphragm, from which an orbicular central portion at length separates with the columella, which contracts within the sporangium. LyelUa is a Nepalese, Bawsonia an Australian genus, extend- ing to New Zealand. In D. superha no part of the peristome adheres to the columella.* Polytrichwm is an enormous genus, and is found everywhere. P. dendroides is a foot or more high, and has a wide range in the southern hemisphere; this, however, is equalled if not ex
RMRDHFM5–. Plant studies; an elementary botany. Botany. 850 PLANT STUDIES tlic body of the sporangium (Fig. 311, rZ), and was at first not recognized as being a spore. These structures had also received names before they were identified with tlie corresponding structures of tlie loAyer groups. The megasporophyll was called a curpeh the megasporangia ovules, and the megasporo an emhriio- m( because the young embryo was observed to develop within it (Fig. 310, em). The strobilus of megasporophylls, therefore, may be called the curpeUate strolUiis or citrpeJlatc cone. As the carpel enters into the organi
RFJ7CFXD–Red raspberry slime, Tubifera ferruginosa, is reddish in color when fresh, but turns brown after maturing
RMRDFBPR–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 370 MOSSES AND FERNS CHAP. Osmunda, and the lamina of the leaf does not show any peculi- arities. In G. pectinata (Boodle (3) ), the stele is a hollow cyl- inder with both internal and external phloem and endodermis (Fig. 210, B). The Sporangium The development of the sporangium has been studied by Bower (19). The young receptacle begins to develop while the leaf is still tightly coiled. From the margin of the circular receptacle, and in some cases also from its upper surface, the r-. Fig, 212
RF2WF2JE8–Arcyria oerstedii, known as candy slime mold
RMRFX8EN–. The Canadian naturalist and geologist. Natural history -- Periodicals. Fig 19. Schistocarpous fruit of Fig. 20. Cleistocarpous fruit of Andrerea. Pleuridium subulaturn. characters enable us conveniently to arrange mosses in three divisions:— Schistocarpi—the Split-fruited Mosses. Cleistocarpi—the Closed-fruited Mosses. Stegocarpi—the Lid-fruited Mosses. The wall of the capsule consists of several layers of cells, the outer of which becomes indurated at maturity, and often richly coloured. Enclosed with in thecapsule is the Sporangium, or Spore-sac, consisting of two strata of cells, the oute
RF2TCK77N–Tubifera ferruginosa, commonly known as raspberry slime mold
RMRDDA96–. Lessons in botany. Botany. Fig. too. Group of sporangia of a mucor (Rhizopus nigricans) showing rhizoids and the stolon extending from an older group. These are small rounded or oval bodies. The wall of the sporangium becomes dissolved, except a small collar around the stalk which remains attached be- low the columella (fig. 101). By this means the gonidia are freed. These gonidia germinate and produce the mycelium again'.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrati
RF2TCK783–Tubifera ferruginosa, commonly known as raspberry slime mold
RMRE2MMJ–. Elementary botany. Botany. FERNS. ^53 which is fastened to the middle of the under side of this shield, as seen in cross section in tig. 292. 532. Sporangia.—If we section through the leaf at one of the fruit dots, or if we tease off some of the sporangia so that the stalks are still attached, and examine them with the mi- croscope, we can see the form and structure of these peculiar bodies. Different views of a sporangium, are shown in fig. 293. The slender portion is the stalk, and the larger part is the spore-case proper. ''e should examine the structure of this spore-case cjuite care-
RF2P4GWAN–Metatrichia floriformis, a slime mold from Finland, no common Rnglish name
RMRDHEB0–. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. 420 THE VASCULAR PLANTS. Fig. 211. — Shows the method by which the sporangium, by means of its an- nulus, discharges the spores. ture is produced by a spore, it is, of course, a gametophyte. The prothallia of true ferns are small, heart-shaped, flat, green bodies. (See Figure 212.) They produce their archegonia and antheridia on the under surface. (See Figure 213.) The sperms of pteridophytes are larger than those of bryophytes and have many cilia. The arc
RMRDW83R–. Elementary botany. Botany. QUILLWORTS. 197 398. Sporangia of isoetes.—If we pull off some of the leaves of the plant we see that they are somewhat spoon-shaped as in fig. 249. In the inner surface of the expanded base we note a circular depression which seems to be of a different text-. Fig. 24V Base of leaf of isoetes, showing sporangium with macrospores. (Isoetes en- gelmannii.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
RF2M84MT5–Metatrichia vesparium, commonly known as wasp nest slime mold, microscope image
RMRPXJHM–. Text-book of botany, morphological and physiological. Botany. 456 VASCULAR CRYPTOGAMS, The development of the sporangium begins with the outgrowth of one of the superficial cells of the placenta which bears the sorus. The subsequent divisions are the same as those above described with reference to Salvinia, so that here also the sporangium is soon elevated on a stalk and consists of a wall of a single layer of cells and of a tetrahedral central cell or archesporium (Fig. 322, I-IIT). From this a tapetum is cut off by four septa parallel to its sides, which, as in the Salviniaceae and in the
RF2NYEH98–Metatrichia vesparium, commonly known as wasp nest slime mold, microscope image
RMRDFC86–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 294 MOSSES AND FERNS CHAP. hypodermal cell in the axis of the young sporangium. This cell divides repeatedly, but apparently without any definite order, and the division of the spores follows in the usual way. From the cells about the archesporium tapetal cells are cut ofif, but these do not disappear, as Goebel (3) asserts, but persist until the sporangium is mature. The growth is greater upon the outer side, which is strongly convex, while the inner face is nearly flat. A section of the near
RMRE00NK–. Essentials of biology presented in problems. Biology. 150 THE VARIOUS FORMS OF PLANTS spores have been formed by the division of the protoplasm mak- ing up the ball or sporangium into many separate bodies. This method of the production of spores is evidently asexual. These spores, if grown imder favorable conditions, will produce more mycelia, which in turn bear sporangia. It has been found, however, that at some time during the life of the mold another method of reproduction is likely to occur. Formation of Zygospores. — Two hyphse which are close-lying put out threads which communicate. Th
RMRDW8E3–. An introduction to vegetable physiology. Plant physiology. 438 VEGETABLE PHYSIOLOGY and which leads to the production of the structure known as the seed, the latter being a special body produced by all members of the group of Spermophytes or flowering plants, and now marking them off clearly from all below them. The phenomenon in question is known as heterospory. Plants which exhibit it bear two kinds of spore, which differ from each other mainly in their relative dimensions. Some are produced in large numbers in a sporangium aiid have usually the structure which has already been described.
RF2P39RM8–Metatrichia vesparium, commonly known as wasp nest slime mold, microscope image
RMRDDA5X–. Lessons in botany. Botany. 162 BOTANY. drawn out of these cells there is produced a pressure from with- out, the atmospheric pressure upon the glycerine. This causes the walls of these cells of the annulus to bend inward, because, as we have already learned, the glycerine does not pass through the walls nearly so fast as the water comes out. 267. "Working of the annulus.—Now the structure of the cells of this annulus, as we have seen, is such that the inner walls and the perpendicular walls are stout, and consequently they do not. Fig. 137. Rear, side, and front views of fern sporangium
RF2HA3EA0–Hemitrichia clavata, a slime mold of the family Trichiidae, no common English name
RMRN6Y7G–. The anatomy of woody plants. Botany -- Anatomy. »—' a. FIG. 224.—(a) longitudinal, (b) transverse, section of wood of bundle in micro- sporophyll of Glnkgo. sporophyll, while the strands of phloem turn outward, to end in the bases of the sporangia. Meanwhile the transfusion elements occur- ring on the upper side of the tracheary strands in their upward course pass imperceptibly into the fibrously thickened mechanical elements which are responsible for the dehiscence of the sporangium. Further, the apex of the tracheary strands passes gradually by means of short transfusion tracheids into the
RF2HB8N6W–Tubifera ferruginosa, known as raspberry slime mold
RMRE1JNA–. A manual of botany. Botany. 264 MANUAL OF BOTANY Fig. 577. body commonly called the embryo. We may have thus thi-ee distinct generations represented in the seed. 1. The megaspore and the remains of the original megasporangium, or the nucellus of the ovule with its integuments. The latter are frequently the only part of the sporangium remaining, the nucellus itself having disappeared. 2. The gametophyte, consisting of a mass of tissue called the endosperm, developed inside the spore or embryo-sac. This again is frequently only represented very slightly, or it may be altogether absent, having
RF2HB7MY8–Tubifera ferruginosa, known as raspberry slime mold
RMRDWFXB–. Elementary botany. Botany. FEKNS. 167 which is fastened to the middle of the under side of this shield, as seen in cross section in fig. 209. 348. Sporangia. —If we section through the leaf at one of the fruit dots, or if we tease off some of the sporangia so that the stalks are still attached, and examine them with the mi- croscope, we can see the form and structure of these peculiar bodies. Different views of a sporangium are shown in fig. 210. The slender portion is the stalk, and the larger part is the spore-case proper. We should examine the structure of this spore-case quite care- full
RF2E1PHG5–Metatrichia vesparium, commonly known as wasp nest slime mold
RMRDWFRJ–. Elementary botany. Botany. 172 MORPHOLOGY. the sporangium with, we can use dried material, for the move- ments of the sporangia can be well seen in dried material, pro- vided it was collected at about the time the sporangia are mature, that is at maturity, or soon afterward. We take some of the dry sporangia (or we may wash the glycerine off those which we have just studied) and mount them in water, and quickly examine <* %. Fig. 211. Dispersion of spores from sporangium of Aspidium acrostichoides, showing different stages in the opening and snapping ot the annulus. them with a microscope
RF2WFW4HB–Fuligo septica, commonly called dog vomit slime mold, scrambled egg slime mold, or flowers of tan
RMRDYFH1–. A textbook of botany for colleges and universities ... Botany. I2& MORPHOLOGY 270, 271, 272). The outer cells are the primary wall cells, which by subsequent divisions give rise to a sporangium wall of at least three layers of cells. The inner cells are the primary sporogenous cells, which by subsequent divisions give rise to a considerable mass of sporogenous tissue (fig. 273). This method of sporangium formation, by which the inner cells, following periclinal division of the superficial initials, give rise to the sporogenous tissue, is called the eusporangiate method, and plants exhibi
RF2WFHP5Y–Fuligo septica, commonly called dog vomit slime mold, scrambled egg slime mold, or flowers of tan
RMRDWP6M–. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. REPRODUCTION OF LYCOPODIUM 315 The spoi'ophylls (Fig. 179, B) are similar to the foliage-leaves, and are commonly in whorls ; they are readily recognised by the single large, somewhat kidney-shaped, sporangium which each bears on its upper surface. In most species the sporophylls are aggregated in cones, as in Eqtiisetuni, although in L. selago, for ex- ample, the reproductive region is not clearly marked, zones of sporo- phylls usually alternating with vegetative leaves. Another pecu- liarity' of this specie
RF2WFDB1A–Ceratiomyxa fruticulosa, commonly known as white coral, slime mold from Finland
RMRHYKCK–. Beginners botany. Botany. Fig. 274. — MucoR. I sporangium; bursting; c b, sporangium , columella. delicate stalk, the sporangiophore. The stalk is separated from the sporangium by a wall which is formed at the base of the spo- rangium. This wall, however, does not extend straight across the thread, but it arches up into the sporangium like an inverted pear. It is known as the col- umella, c. When the sporangium is placed in water, the wall immediately dissolves and allows hundreds of spores, which were formed in the cavity within the SDorangium, to escape, b. All that is left of the fruit is
RF2WFTY78–Ceratiomyxa fruticulosa, commonly known as white coral, slime mold from Finland
RMRH4W8B–. Botany for agricultural students. Plants. THE TWO GENERATIONS 411. foot extends into the gametophore and absorbs food which is supplied to the elongating stalk and developing sporangium. In the sporangium are produced numerous spores and also elongated twisted cells called elaters, which assist in scattering the spores. When the spores arc mature the sporangial wall opens and the spores are scattered. When the spores fall on a moist substra- tum, they germinate and produce new thallus plants like the ones described. The Two Generations. — The ob- long body produced by the fertilized egg, and
RF2T7B442–Tubifera ferruginosa, commonly known as raspberry slime mold
RMRE1J5Y–. Plant studies; an elementary botany. Botany. PTERIDOPIIYTES 331 In the ordinary Ferns all the spores in the sporangia are alike, and when they germinate each spore produces a prothallium upon which both antheridia and archegonia appear. In some Pteridophytes, however, there is a decided dif- ference in the size of the spores, some being quite small and. Fig. 301. A series showing the dehiscence of a fern sporangium, the rupture of the wall, the straightening and bending back of the annulus, and the recoil.—After Atkinson.. Please note that these images are extracted from scanned page images
RF2M84MMX–Metatrichia vesparium, commonly known as wasp nest slime mold, microscope image
RMRDDA3D–. Lessons in botany. Botany. 182 BOTANY. membered that sterile strands of tissue are found in some of the liverworts in the form of elaters. 298. Microspores and macrospores.—The spores of isoetes are of two kinds, small ones (microspores) and large ones (macro- spores). When one kind of spore is borne in a sporangium usually all in that sporangium are of the same kind, so that certain sporangia bear microspores, and others bear macrospores. But. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
RF2NYEGWW–Metatrichia vesparium, commonly known as wasp nest slime mold, microscope image
RMRPWXPJ–. Text-book of botany, morphological and physiological. Botany. 480 VASCULAR CRYPTOGAMS. beneath the sporangium without giving off a branch to it. By repeated divisions of the primary cells a mass of tissue is formed which is differentiated into an outer layer of cells, the wall of the sporangium, and an internal group of cells, one of which is the archesporium; the tapetum (Fig. 337, c) is formed toward the free surface of the sporangium, from cells which are cut off from the archesporium, and it is completed toward the base by cells which are cut off by tangential walls from the cells which
RF2HD2JX6–Metatrichia vesparium, commonly known as wasp nest slime mold
RMRDFC16–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 344 MOSSES AND FERNS CHAP. the annulus arises from the upper or cap segment of the spo- rangium wall, and extends from the stomium over the top of the sporangium, and joins the part of the annulus upon the other side. The walls of all the cells are at first alike, but those of the annulus begin to thicken, this being confined to their inner and radial walls, the outer walls remaining thin. In most species the cells of the annulus are the same for the whole ex- tent, but in Polypodium falcatum
RF2HD2JX9–Metatrichia vesparium, commonly known as wasp nest slime mold
RMREFA71–. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. CH.VII1.—MORPHOLOGY AND COURSE OF DEVELOPMENT.—MYXOMVCETES. 435 as in Trichia and Arcyria, or is separated from it by a transverse wall; if the septum is convex upwards it is termed the columella or central column (Fig. 189). The cavity of the stalk varies in breadth in different species and contains nothing but air, as in Physarum hyalinum, or is filled in the manner which will be described below. The structure of the membrane of the sporangium in most of the species which c
RF2H9HG79–Reticularia lycoperdon, also called Enteridium lycoperdon, commonly known as the false puffball, slime mold from Finland
RMRDYF6K–. A textbook of botany for colleges and universities ... Botany. PTERIDOPHYTES 179 ferns, and that Salviniaceae have the transverse wall of the older eusporangiate Marattiaceae. Conclusions. — It is evident that the water ferns are a very specialized aquatic group, probably derived from the leptosporangiate ferns. More- over, the features of the sporangium, in development and output, in- dicate an origin from one of the higher leptosporangiate families. The. Figs. 416, 417. — Female gametophyte of Marsilea: 416, the tissue protruding from the heavy megaspore wall developing a single large arch
RF2HB7MYG–Tubifera ferruginosa, known as raspberry slime mold
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