. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIATM 389 show a certain likeness to Botrychiiim. The sporangia arise always in acropetal order from the apex of the terminal seg- ments (sorophore) of the sporophyll, and are strictly lateral in origin, not originating from epidermal cells, but from marginal ones. The young sporangium appears as a lateral outgrowth of the margin, exactly like a young pinna upon the main axis, and the young sorophore has the appearance of a young pinnate leaf, and at this stage recal

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. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIATM 389 show a certain likeness to Botrychiiim. The sporangia arise always in acropetal order from the apex of the terminal seg- ments (sorophore) of the sporophyll, and are strictly lateral in origin, not originating from epidermal cells, but from marginal ones. The young sporangium appears as a lateral outgrowth of the margin, exactly like a young pinna upon the main axis, and the young sorophore has the appearance of a young pinnate leaf, and at this stage recalls strongly the similar one in Bo- trychium. This is especially marked in Aneimia and Lygo-. 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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