. Plants; a text-book of botany. Botany. HYDROPHYTE SOCIETIES. 173 out of water submerged plants which seem to be upright, with all their parts properly spread out. When removed they collapse, not being able to support themselves in any way. (o) Development of air cavities.—The presence of air in the bodies of water plants is necessary for two reasons: (1),. ^i :^ -"Jv- Fig. 155. Bladderwort, Bhowing the numerous bladders which float the plant, the finely divided water leaves, and the erect flowering stems. The bladders are also efilective " insect traps," Utrici'lana being one
. Plants; a text-book of botany. Botany. HYDROPHYTE SOCIETIES. 173 out of water submerged plants which seem to be upright, with all their parts properly spread out. When removed they collapse, not being able to support themselves in any way. (o) Development of air cavities.—The presence of air in the bodies of water plants is necessary for two reasons: (1),. ^i :^ -"Jv- Fig. 155. Bladderwort, Bhowing the numerous bladders which float the plant, the finely divided water leaves, and the erect flowering stems. The bladders are also efilective " insect traps," Utrici'lana being one of the " carnivorous ; —.\fter Keener. to aerate the plant ; (2), to increase its buoyancy. In most complex water plants there must be some arrangement for the distribution of air containing oxygen. This usually takes the form of air chambers and passageways in the body of the plant (see Pigs. 87, 88, 89, 156). Of course such air chambers increase the buoyancy of the body. Sometimes, however, a special buoyancy is provided for by the development of regular floats, which are bladder-. 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. New York, D. Appleton and company
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