. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIATM 385. ination is like that of the Polypodiaceae, and a filament is first' formed, after which the flat prothallium grows for a time by a single apical cell, which is finally replaced by a group of mar- ginal cells. In Aneimia and Mohria the growing point lies on one side, so that the prothallium is not heart-shaped. In Ly- godium, however, the prothallium has the ordinary form. The development of the antheridia has been studied by Kny (4) in Aneimia hirta. The o
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIATM 385. ination is like that of the Polypodiaceae, and a filament is first' formed, after which the flat prothallium grows for a time by a single apical cell, which is finally replaced by a group of mar- ginal cells. In Aneimia and Mohria the growing point lies on one side, so that the prothallium is not heart-shaped. In Ly- godium, however, the prothallium has the ordinary form. The development of the antheridia has been studied by Kny (4) in Aneimia hirta. The only difiference between this and. Fig. Z23.—Aneimia hirsuta. A, Section of the rhizome, X30; B, part of the central region, X300. the normal antheridium of the Polypodiaceae is that in Aneimia the first wall is always flat instead of funnel-shaped, and the basal cell of the antheridium is therefore disc-shaped. The archegonia appear to correspond exactly v^^ith those of the Poly- podiaceae. The genus Schizcea, to judge from 5". pusilla (Britton and Taylor (i)), and 5". dichotoma (Thomas (i)), differs mark-. 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 Campbell, Douglas Houghton, 1859-1953. New York, The Macmillan Company;
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