. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIATM 387 dies as in other Ferns. Sclerenchyma is largely developed, especially in the petioles, where the whole mass of ground tissue in Lygodium (Fig. 224) is composed of this tissue. In one section of Aneimia the stele (Fig. 223) has the form of a continuous tube with both external and internal phloem and endodermis (see also Boodle (2)). The leaves are pinnate in all the forms except a few species of Schizcea. Lygodium, as is well known, shows a continuous growth
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIATM 387 dies as in other Ferns. Sclerenchyma is largely developed, especially in the petioles, where the whole mass of ground tissue in Lygodium (Fig. 224) is composed of this tissue. In one section of Aneimia the stele (Fig. 223) has the form of a continuous tube with both external and internal phloem and endodermis (see also Boodle (2)). The leaves are pinnate in all the forms except a few species of Schizcea. Lygodium, as is well known, shows a continuous growth at the apex of the leaf, something like Gleichenia, but here the primary apex retains its meristematic condition, and the extremely long and slender axis of the leaf twines about its support like the stem of many climbing plants. The sporo-. FiG. 225.—Aneimia hirsnta. A, Sporophyll, showing the two fertile pintije, sp.; B, segment of the fertile pinna, enlarged; C, D, sporangia, X about 40. phylls are usually smaller than the sterile leaves, or where only portions of the leaf are sporiferous these are much contracted. The anatomy of the leaf corresponds closely with that of the other Ferns. The stomata, which are for the most part con- fined to the lower side of the leaf, are always arranged in two parallel rows in Schisaa, and the peculiar stomata of Aneimia have already been mentioned. The trichomes are for the most part hairs. Only in Mohria do scales occur. In Schicaa pusilla the sterile leaves are filiform, without. 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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