. Plant physiology. Plant physiology. ASSIMILATION OF CARBON 37 dioxide from the air, which is especially true in the case of insectivorous plants.' These latter are green and can assimilate carbon dioxide, but, at the same time, they are provided with a characteristic mechanism for catching and digesting insects (Fig. 19). In this class, for instance, belongs the widely distributed sundew {Drosera rotundifolia), which grows in bogs. Its leaves are covered with pin-shaped tentacles or glands, which secrete a sticky fluid. As an insect alights upon the leaf the tentacles bend toward it, a copio
. Plant physiology. Plant physiology. ASSIMILATION OF CARBON 37 dioxide from the air, which is especially true in the case of insectivorous plants.' These latter are green and can assimilate carbon dioxide, but, at the same time, they are provided with a characteristic mechanism for catching and digesting insects (Fig. 19). In this class, for instance, belongs the widely distributed sundew {Drosera rotundifolia), which grows in bogs. Its leaves are covered with pin-shaped tentacles or glands, which secrete a sticky fluid. As an insect alights upon the leaf the tentacles bend toward it, a copious flow of an acid liquid. Fig. 19.âAbove, a leaf of Drosera rotundifolia, whose tentacles on the .left side have responded to a stimulus, and one of Nepenthes gracilis. Below, a leaf of Dionaea muscipula; A, open; B, closed, with an imprisoned earwig. {After Pfeffer.) containing a pepsin-like enzyme takes place, and the insect is digested. Sundew can also digest and absorb lean meat and white of egg. In Nepenthes ^ a part of the petiole is modified into a tankard-shaped structure with the leaf-blade acting as the cover. The hollow portion contains a weakly acid solution, in which imprisoned insects are digested. Each leaf of Dionaea' muscipula con- sists of a flattened petiole and a rounded leaf-blade divided by the midrib into â Daiwin, Charles R., Insectivorous Plants. London, 187s. * Clautriau, G., La digestion dans les urnes de Nepejilhes. Recueil Inst. Bot. Bruxelles s: 89-133. 1902. Vines, S. H., The proteolytic enzyme of 2V«i)eB(A«s (III). Ann. bot. 15: 563-573- 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 Palladin, Vladimir Ivanovich, 1859-1922; Livingston, Burton Edward, 1875-; Hopping, Aleita, 1890-. Philadelphia, P. Blakiston's Son & Co
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