. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Fig. 253.—Marsilia vestita. A, Vertical longitudinal section of the stem apex, X80; L, leaves; st, stem apex; r, roots; B, the stem apex, X4S0; C, horizontal section of very young leaf, X450; D, similar section of an older one, X450; E, cross-section of petiole, X80. marked dry season, grow in shallow ponds or pools, which dry up as the end of the growing period approaches, and the ripen- ing of the sporocarps takes place after the water has evaporated. In the first case the petioles are extre

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. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Fig. 253.—Marsilia vestita. A, Vertical longitudinal section of the stem apex, X80; L, leaves; st, stem apex; r, roots; B, the stem apex, X4S0; C, horizontal section of very young leaf, X450; D, similar section of an older one, X450; E, cross-section of petiole, X80. marked dry season, grow in shallow ponds or pools, which dry up as the end of the growing period approaches, and the ripen- ing of the sporocarps takes place after the water has evaporated. In the first case the petioles are extremely long and weak, and the leaf-segments float upon the surface. In the other case the petioles are much shorter and stouter, and the leaves are borne upright. The young leaves are circinate, as in the ordinary Ferns, and in. Pilularia retain the same structure as the coty-. 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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