. Carnegie Institution of Washington publication. . Fig. 100. A. Cross-section of a ripe antheridium of B. Cross-section of an empty antheridium; m, mantle cells. C-D. Surface views, showing opercular cell. All figures X 350. In Marattia and Angiopteris (plate 2, tig. 4+) the nucleus of the spermatocyte becomes much more extended and the whole spermatozoid is more slender than in Kaulfussia. Indeed there is very little difference between the appearance of the spermatozoids of Angiopteris and Marattia and those of the typical leptosporangiate ferns. Some observations were made al
. Carnegie Institution of Washington publication. . Fig. 100. A. Cross-section of a ripe antheridium of B. Cross-section of an empty antheridium; m, mantle cells. C-D. Surface views, showing opercular cell. All figures X 350. In Marattia and Angiopteris (plate 2, tig. 4+) the nucleus of the spermatocyte becomes much more extended and the whole spermatozoid is more slender than in Kaulfussia. Indeed there is very little difference between the appearance of the spermatozoids of Angiopteris and Marattia and those of the typical leptosporangiate ferns. Some observations were made also upon Datura, in which the spermatozoid is somewhat intermediate in character between that of Angiopteris and kaulfussia (plate 2, figs. 42, 43). In size the spermatozoids are more like those of Angiopteris, but the nucleus is much less elongated and the general form of the spermatozoids is more like that of Kaulfussia. THE VRCHEGONIl M. The archegonium in the Marattiaceae, like the antheridium, very much resembles that of Ophtoglossum, but the neck of the archegonium is even less developed than in the latter. Jonkmann ( Jonkmann I) has given a fairly complete account of the development in Marattia and Angiopteris, and Farmer (Farmer 1) has described and figured the archegonium of the latter genus. Usually, at least, the archegonium is developed only upon the cushion of tissue back of the apex, the young archegonia arising in acropetal succession. Jonkmann. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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