. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 2g8 MOSSES AND FERNS CHAP. the sporangium wall. This may have been due to different conditions under which .the plants were grown, or to a possible difference in the species. There is frequently found surrounding the synangium, hairs or scales which form a sort of indusium (Fig. 165). In Dancea, the leaf tissue between the synangia grows up as a ridge, with expanded top overarching them. This ridge in sec- tion appears T-shaped (Fig. 166, A).. Pig. 169.—A small plant of Dantsa alata, Xl^; st^

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. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 2g8 MOSSES AND FERNS CHAP. the sporangium wall. This may have been due to different conditions under which .the plants were grown, or to a possible difference in the species. There is frequently found surrounding the synangium, hairs or scales which form a sort of indusium (Fig. 165). In Dancea, the leaf tissue between the synangia grows up as a ridge, with expanded top overarching them. This ridge in sec- tion appears T-shaped (Fig. 166, A).. Pig. 169.—A small plant of Dantsa alata, Xl^; st^ stipules. Classification of the Marattiace^ The living Marattiacese (Bitter (i)) may be divided into four sub-families, of which the first, Angiopterideae includes two genera, Angiopteris and Archangiopteris, while the others, Marattiese, Kaulfussiese, and Danseaae, contains each but a single 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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