. The Canadian naturalist and geologist. Natural history -- Periodicals. 1868.] BRA1THWAITE—ORGANIZATION OF MOSSES. 473 of forms (figs. 24, 25, 26). They consist of two strata of cells, the outer in two rows, transversely jointed (trabeculate), richly coloured, and often separated for a part of their length, in the central or divisural line; the inner in one row, thin and hygros- copic, and projecting inward as transverse lamellae (figs. 22, 23, 27). In the Poly- trichaceae, however, they are quite different, and consist of a mass of agglutinated filaments, and Mr. Mitten uses this distinction
. The Canadian naturalist and geologist. Natural history -- Periodicals. 1868.] BRA1THWAITE—ORGANIZATION OF MOSSES. 473 of forms (figs. 24, 25, 26). They consist of two strata of cells, the outer in two rows, transversely jointed (trabeculate), richly coloured, and often separated for a part of their length, in the central or divisural line; the inner in one row, thin and hygros- copic, and projecting inward as transverse lamellae (figs. 22, 23, 27). In the Poly- trichaceae, however, they are quite different, and consist of a mass of agglutinated filaments, and Mr. Mitten uses this distinction to separate all mosses into two sections, Fig. 23. Transverse sec tion of tooth of outer Fig. 24. Fruit of Tetraphis Fig. 25. Splachnum sphaericum, pellueida, peristome of with eight bigemiuate teeth, four teeth. and exserted columella. Arthrodonti, those with jointed teeth, and Nematodonti, those with filamentous teeth. In the Polytricha, also, the top of the colu- mella is dilated into a membrane, closing the mouth of the capsule, and joined to the points of the teeth ; this expansion has leen named the epiphragm or tympanum (fig. 27).. 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 Natural History Society of Montreal. Montreal, Dawson
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