. Nature and development of plants. Botany. 306 CAPSULE OF BRYALES on has here resulted in the transformation of the upper part of the dome-shaped zone of sporogenous cells into vegetative cells (Figs. 210, 3; 211, 6). The sporogenous tissue is usually sur-. FiG. 210. The mature sporophyte of Polytrickum: I, moss plant bearing sporophyte. lA, calyptra removed, showing capsule, which has curved to one side. 2, capsule, the calyptra, 2A, removed, showing the operculum or lid and the enlarged apophysis, a, at base. 25, capsule with operculum re- moved, showing the teeth-lilce peristome and the ep

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. Nature and development of plants. Botany. 306 CAPSULE OF BRYALES on has here resulted in the transformation of the upper part of the dome-shaped zone of sporogenous cells into vegetative cells (Figs. 210, 3; 211, 6). The sporogenous tissue is usually sur-. FiG. 210. The mature sporophyte of Polytrickum: I, moss plant bearing sporophyte. lA, calyptra removed, showing capsule, which has curved to one side. 2, capsule, the calyptra, 2A, removed, showing the operculum or lid and the enlarged apophysis, a, at base. 25, capsule with operculum re- moved, showing the teeth-lilce peristome and the epiphragm, which has been lifted up at one side. 3, section of nearly mature capsule—sp, cyl- inder of spore-forming cells that is surrounded on its inner and outer sides by loosely arranged chlorophyll cells; 0, operculum; r, annulus; p, peri- stome; e, epiphragm; u., apophysis. 3.4, stoma of apophysis. 3B, cross- section of capsule—sp, spore-forming cells. 4.A, portion of mouth of cap- sule, showing position of peristome and epiphragm in dry weather. 45, peristome pressed down on epiphragm, closing the capsule in damp weather- —H. O. Hanson.. 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.. Curtis, Carlton Clarence, 1864-1945. New York, H. Holt