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BRYOPHYTES
Marchantiales, Anthocerales
and Polytrichales
Dr. K. Kannathasan
Assistant Professor of Botany
APA COLLEGE OF ARTS & CULTURE,
PALANI 624 601
Marchantiales Polytrichales
Distribution Widely distributed Tropical and
temperate countries
Genus and
Species
35 and 420 15 and 350
Examples Marchantia, Targionia,
Reboulia, Riccia,
Plagiochasma
Polytrichum,
Pogonatum,
Atrichum,
Oligotrichum, Lyellia
Gametophyte
External
Strictly thallose
Green, flat and thick,
dichotomous branch
Apical notch, Areole
Smooth and tuberculate
rhizoids,
Scales
Highly organised
Leaf-distal limb and
proximal sheathing
base
Lamellae
Gametophyte
Internal
Two distinct region
Photosynthetic and
Storage region.
Air pores and chambers
present
Epidermis, Cortex
and Central Strand
Thallus ̶ External
Marchantia Anthoceros Polytrichum
Thallus ̶ Internal
Marchantia
Anthoceros
Polytrichum
Stem
Leaf Rhizome
Sexual Reproduction
Antheridiophore
Anthoceros Polytrichum
Marchantia
Archegoniophore
Antheridium
Archegonium
Antheridium
Archegonium
SPOROPHYTE
Marchantia Anthoceros Polytrichum
Marchantiales Polytrichales
Asexual
Reproduction
Fragmentation (Riccia,
Marchantia)
Adventitious branches
(Targionia, Riccia)
Gemma(Marchantia,
Lunularia)
Tuber(Riccia)
Vegetative buds
(Bulbils)
Death or breakage of
rhizoids
Sexual
Reproduction
Sex organs : dorsal,
acropetal order
Sessile or stalked
Antheridia surrounded
by perigonial cluster
Archegonia
surrounded
perichaetial leaves
Sporophyte Calyptra:cover
Foot, seta and capsule
Capsule wall single layer
Elaters present
Columella
Operculum
Peristome
Capsule several layers
THANK YOU

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Marchantiales, Anthocerales and Polytrichales : A comparision