. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. BRYOPHTTA. 703 away the spores are ripe, and the columella, &c, have dried up and collapsed. The teeth of the peristome are exceedingly varied in pattern in the various genera of Mosses; typically there are two series of them forming an outer and an inner peri- stome (c/. fig. 397»), but they are differently thickened, fused, and divided, and one or even both series ( Gymnostomwm), may be absent. They are very hygro- scopic, and their function will be alluded to later on when we are discussin
. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. BRYOPHTTA. 703 away the spores are ripe, and the columella, &c, have dried up and collapsed. The teeth of the peristome are exceedingly varied in pattern in the various genera of Mosses; typically there are two series of them forming an outer and an inner peri- stome (c/. fig. 397»), but they are differently thickened, fused, and divided, and one or even both series ( Gymnostomwm), may be absent. They are very hygro- scopic, and their function will be alluded to later on when we are discussing the. Kg. 399.—Spore-capsules ol Mosses. 1 Splachnujn lutev/m. 2 An unripe capsule of the same. 3 A ripe and open capsule of the same. * Splacknum vasculomm. 5 Xongitudinal section of a ripe capsule of this moss, showing the large apophysis helow containing lacunse, and traversed in the middle by the columella; above is the capsule proper with persistent columella, spore-sac, and peristome. 8 Spktchnum ampullaceum.' ' An unripe capsule. 8 A ripe capsule of the same. 9 and,io Schistostega osmundacea. 11 A ripe capsule of the same, i, * «, J" natural size; 2, s x 2; ', b, 9 x 10; " x 16; « x 100. distribution of spores. In the Polytrichese the peristome is not quite the same as in other Mosses. In this group the teeth are very numerous and quite short, and from their apices a membrane (the epiphragm) remains stretched after the fall of the lid (c/. fig. 397 *). The spores here tumble out between the teeth. The position of the sporogonium is of course determined by that of the female "flowers"; where these are terminal the sporogonium will be terminal (acrocarpous), similarly where lateral (pleurocarpous). The number of genera of Bryacese is so. 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
