. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. VII PTERIDOPHYTA—FILICINE^—OPHIOGLOSSACEJE 237 from which the cover of the antheridium is formed. The outer wall of the antheridium remains for the most part but one cell thick, in tljis respect more resembling Marattia than it does Botrychium. The antheridium also opens by a single, nearly triangular opercular cell (Fig. 125, E), as it does in Marattia. The spermatozoids were not seen, but probably resemble those of Botrychium or Marattia. The first division of the young archegonium is the sa
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. VII PTERIDOPHYTA—FILICINE^—OPHIOGLOSSACEJE 237 from which the cover of the antheridium is formed. The outer wall of the antheridium remains for the most part but one cell thick, in tljis respect more resembling Marattia than it does Botrychium. The antheridium also opens by a single, nearly triangular opercular cell (Fig. 125, E), as it does in Marattia. The spermatozoids were not seen, but probably resemble those of Botrychium or Marattia. The first division of the young archegonium is the same as in. Fig. 126.—A, Longitudinal section of a large prothallium of Botrychium Virginianum, X15; B, transverse section of a somewhat younger one, showing the antheridial ridge, and the archegonia; C, prothallium of Helminthostachys Zeylanica, X7; D, young antheridium of Helminthostachys, X22S. (C, D, after Lang.) the antheridium. From the inner cell, after it divides into a basal and a central cell, is formed the axial row of cells—the tgg cell and the canal cells. No division of the neck canal cell was observed beyond the division of the nucleus, and the ventral canal was not seen; but the latter is doubtless formed before the archegonium is mature. The neck of the archegonium remains very short, scarcely. 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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