. A textbook of botany for colleges and universities ... Botany. LEAVES 6ii the leaves are moist from rain or dew; in addition to lessened opportu- nity for leaf absorption, such mosses also are exposed to greater tran- spiration than are mosses in general. In other mosses and liverworts rhizoid absorption probably supplements leaf absorption, but it is probable that in most cases the latter exceeds the former (p. 517). ' Remarkable cases of leaf absorption are afforded by various mosses. Fig. 898. — Cushion plants, which absorb water readily through the aerial organs; the light-colored cushio
. A textbook of botany for colleges and universities ... Botany. LEAVES 6ii the leaves are moist from rain or dew; in addition to lessened opportu- nity for leaf absorption, such mosses also are exposed to greater tran- spiration than are mosses in general. In other mosses and liverworts rhizoid absorption probably supplements leaf absorption, but it is probable that in most cases the latter exceeds the former (p. 517). ' Remarkable cases of leaf absorption are afforded by various mosses. Fig. 898. — Cushion plants, which absorb water readily through the aerial organs; the light-colored cushions are reindeer lichens (Cladonia rangiferina), and the dark-colored cushion is a moss, Bartramia pomiformis; Grand Marais, Minn. —From MacMillan. that grow in dense cushions (as Dicranum, Leucobryum, Sphagnum, fig. 898). Such cushions may be regarded as systems of capillaries con- nected with the substratum;. thus a constant supply of water is available for the leaves, except in very dry weather. Since each year the individual stems of a cushion grow at the apex and die at the base, it is unlikely that the soil rhizoids are of any significance in absorption, at least after the cushion is a few years old; the aerial rhizoids that develop in some species probably facilitate capillary activity. The most noteworthy of. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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