. The power of movement in plants . Plants; Botany. Chap. IV. CIRCUMNUTATION OF CRYPTOGAMS. 257 small spaee, but during the night and the whole following day it ascended in the same general direction; the ascent being effected by repeated up and down well-pronounced oscillations. Ceyptogams. (34.) Nephrodium molle (Pilices, Fam. 1).—A filament was fixed near the apex of a young frond of this Fern, 17 inches in height, which was not as yet fully uncurled; and its move- ments were traced during 24 h. Vo see in Eig. 119 that it Kig. Nephrodium molle: circumnutation of rachis, traoed from 9.
. The power of movement in plants . Plants; Botany. Chap. IV. CIRCUMNUTATION OF CRYPTOGAMS. 257 small spaee, but during the night and the whole following day it ascended in the same general direction; the ascent being effected by repeated up and down well-pronounced oscillations. Ceyptogams. (34.) Nephrodium molle (Pilices, Fam. 1).—A filament was fixed near the apex of a young frond of this Fern, 17 inches in height, which was not as yet fully uncurled; and its move- ments were traced during 24 h. Vo see in Eig. 119 that it Kig. Nephrodium molle: circumnutation of rachis, traoed from May 28th to 9 29th. Figure here given two-thirds of original scale. plainly circumnutated. The movement was not greatly magnified as the frond was placed near to the vertical glass, and would probably have been greater and more rapid had the day been warmer. For the plant was brought out of a warm greenhouse and observed under a skylight, where the temperature was between 15° and 16° C. We have seen in Chap. I. that a frond of this Pern, as yet only slightly lobed and with a rachis only '23 inch in height, plainly circumnutated.* * Mr. Loomis and Prof. Asa Gray have described (' Botanical Gazette," 1880, pp. 27, 43), an extremely curious case of more- men t in the fronds, but only in tlie fruiting fronds, oi Asplenium triehomanes. They move almost ns rapidly as the little leaflets of Desmndium gyrann, alternately backwards and forwards through from 20 to 40 degrees, in a plane at right angles to that of the frond. The apex of the frond describes " a long and very narrow ellipse," so that it circuranutates. But the movement differs from ordinary. 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 Darwin, Charles, 1809-1882; Darwin, Francis, Sir, 1848-1925. New York : D. Appleton
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Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
