. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROVS LEPTOSPORANGIATM 3SI for a year or more. In O. cinnamomea they first appeared about two weeks later. While they are almost always present upon the large female prothallia,^ numerous exclusively male plants are always met with. These latter are usually irregular in form, and even filamentous, especially when crowded. Upon the latter the antheridia are either terminal or marginal; in the flattened prothallia they occur mainly upon the margin and. Fig. 194.â^A, Prothallium of O. C
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROVS LEPTOSPORANGIATM 3SI for a year or more. In O. cinnamomea they first appeared about two weeks later. While they are almost always present upon the large female prothallia,^ numerous exclusively male plants are always met with. These latter are usually irregular in form, and even filamentous, especially when crowded. Upon the latter the antheridia are either terminal or marginal; in the flattened prothallia they occur mainly upon the margin and. Fig. 194.â^A, Prothallium of O. Claytoniana, about two months old, X about 30; B, base of an older prothallium of the same species with a secondary prothallium C/*?^) growing from it, X80; ^, antheridia; C, small branching male prothallium of the same species, X75. lower surface of the wings. The development corresponds closely in all forms that have been examined, and differs con- siderably from that of the Polypodiaceae. The mother cell is cut off as usual, but the second wall is not funnel-shaped, but plane and inclined, so that it strikes the basal cell. In the larger of the two cells thus formed a vary- â Luerssen (/. c. p. 449) states that they are often absent from very vig- orous prothallia.;. 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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