. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 384 MOSSES AND FERNS chap. not seen at all, and the origin of the young sporophyte was un- mistakably non-sexual. Prothallia, arising directly from the leaf, or from the sporangial receptacle, were found to be a com- mon phenomenon in the same species. The Schiz^ace^ (Diels (i)) The Schizaeacese include about sixty species belonging to five genera. The very characteristic sporangia have a terminal annulus, which forms a sort of crown at the apex. Some of them, like Schiscsa pusilla and Trochop
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 384 MOSSES AND FERNS chap. not seen at all, and the origin of the young sporophyte was un- mistakably non-sexual. Prothallia, arising directly from the leaf, or from the sporangial receptacle, were found to be a com- mon phenomenon in the same species. The Schiz^ace^ (Diels (i)) The Schizaeacese include about sixty species belonging to five genera. The very characteristic sporangia have a terminal annulus, which forms a sort of crown at the apex. Some of them, like Schiscsa pusilla and Trochopteris elegans, are very. Fig. 222.—^A, Prothallium of Aneimia Phyllitidis, X180; B, female; C, male, prothallia of Schisaea pusilla, X30 (A after Bauke, B, C, after Britton & Taylor.) small and delicate plants. In the largest species of Lygo- dimn the slender twining fronds may reach a great length. Ac- cording to Hooker (2), the New Zealand species L. articu- latum, may reach a length of 50—100 feet. The Gametophyte According to Bauke (2), the prothallium in Lygodium, 'Aneimia, and Mohria is much like that of the Polypodiaceae, except that in the two latter genera (Fig. 222), the growing point is at one side. The spores are tetrahedral, and contain ho chlorophyll until after germination has begun. The germ-. 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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