. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 386 MOSSES AND FERNS CHAP. edly from the other genera in the form of the prothallium, which is filamentous and extensively branched, resembling very closely that of certain species of Trichomanes (Fig. 222, B, C). The antheridia resemble those of Aneimia, but the archegonium has the straight neck found in the lower Leptosporangiatse. The Sporophyte The tissues of the sporophyte in Lygodium and Schizcea are much like those of Gleichenia and the Hymenophyllaceae. As in these the stem as well as
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 386 MOSSES AND FERNS CHAP. edly from the other genera in the form of the prothallium, which is filamentous and extensively branched, resembling very closely that of certain species of Trichomanes (Fig. 222, B, C). The antheridia resemble those of Aneimia, but the archegonium has the straight neck found in the lower Leptosporangiatse. The Sporophyte The tissues of the sporophyte in Lygodium and Schizcea are much like those of Gleichenia and the Hymenophyllaceae. As in these the stem as well as the petiole is traversed by a single. Fig. 224-—Lygodium Japonicum. Aj Pinnule, X3; ;?*, the sporangial segments; B, horizontal section of one of the latter showing the sporangia, sp, X14; C, a single sporangium, showing the terminal annulus (r), X65; cross-section of the petiole, X6s. concentric vascular bundle. In most species of Aneimia and Mohria the bundles of the stem form a cylindrical network like that of the Polypodiacese. The stem bundles are concentric, as are those of the petiole and larger veins in all but Schizcea, which Prantl ((5), p. 23) states has collateral bundles through- out, except in the stem. The small veins have collateral bun-. 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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