. Plants; a text-book of botany. Botany. THE GKEAT GRODl-S OF ALG^ 35 feet long, whose stalk develops root-like holdfasts (Fig. 18a). The largest body is developed by an Antarctic Laiiiinaria form, which rises to the surface from a sloping bottom with a floating thallus six hundred to nine hundred feet long. Other forms rise from the sea bottom like trees, with thick trunks, numerous branches, and leaf-like appendages. The common Fucus, or " rock weed," is rib- bon-form and constantly branches by forking at the tip (Fig. 19). This method of branching is called dicTiotomoiis, as dis-
. Plants; a text-book of botany. Botany. THE GKEAT GRODl-S OF ALG^ 35 feet long, whose stalk develops root-like holdfasts (Fig. 18a). The largest body is developed by an Antarctic Laiiiinaria form, which rises to the surface from a sloping bottom with a floating thallus six hundred to nine hundred feet long. Other forms rise from the sea bottom like trees, with thick trunks, numerous branches, and leaf-like appendages. The common Fucus, or " rock weed," is rib- bon-form and constantly branches by forking at the tip (Fig. 19). This method of branching is called dicTiotomoiis, as dis- tinct from that iu which branches are put out from the sides of the axis {monopodial). The swol- len air - bladders distrib- uted throughout the body are very conspicuous. The most differenti- ated thallus is that of tSt/rgasmm (Fig. 20), or " gulf weed," in which there are slender branch- ing stem-like axes bearing lateral members of various kinds, some of them like ordinary foliage leaves; others are floats or air- bladders, which sometimes resemble clusters of berries; and other branches bear the sex organs. All of these structures are but diSerent regions of a branching thallus. Sargassum forms are often torn from their anchorage by the waves and carried away from the coast by currents, collecting in the great sea eddies. Fig. 19. Fragment of a common brown alga {Fucu8\ showing the body with dichotomous branching and bladder-like air-bladders.—After 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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