. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 90 MOSSES AND FERNS CHAP. In the ordinary form four sets of segments are cut off,—dorsal and ventral, as in Riccia or Spharocarpus, and two sets of lateral ones. In Pellia calycina the apical cell shows a similar form, but in P. epiphylla (Fig. 42, D, E), another type is seen. Here, while the surface view is the same as in P. caly-. FiG. 4i'-~A, Pallavicinia cylindrica, X4; per, the elongated perianth; B, Aneura pin- natiUda, X6; ^, archegonial branches; C-E, Fossombronia longiseta, X4; F, Bla

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. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 90 MOSSES AND FERNS CHAP. In the ordinary form four sets of segments are cut off,—dorsal and ventral, as in Riccia or Spharocarpus, and two sets of lateral ones. In Pellia calycina the apical cell shows a similar form, but in P. epiphylla (Fig. 42, D, E), another type is seen. Here, while the surface view is the same as in P. caly-. FiG. 4i'-~A, Pallavicinia cylindrica, X4; per, the elongated perianth; B, Aneura pin- natiUda, X6; ^, archegonial branches; C-E, Fossombronia longiseta, X4; F, Blasia pusilla, X4- cina, in vertical section the cell is nearly semicircular, i. e., here there are but three sets of segments, two lateral ones and a basal one, extending the whole depth of the thallus, and only. 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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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910