. Plant studies; an elementary botany. Botany. 242 PLANT STUDIES in rivers and lakes (Fig. 207). The cells are long and densely crowded with chloroplasts ; and in certain cells at the tips of branches large numbers of zoospores are formed, which have two cilia at the pointed end, and hence are said to be biciliate. 166. Vaucheria.—This is one of the most common of the Green Algse, found in felt-like masses of coarse filaments in shallow water and on muddy banks, and often called " green j^ Fig. 208. Vaucheria geminata, a Siphon form, showing a portion of the ccenocytic body (A)
. Plant studies; an elementary botany. Botany. 242 PLANT STUDIES in rivers and lakes (Fig. 207). The cells are long and densely crowded with chloroplasts ; and in certain cells at the tips of branches large numbers of zoospores are formed, which have two cilia at the pointed end, and hence are said to be biciliate. 166. Vaucheria.—This is one of the most common of the Green Algse, found in felt-like masses of coarse filaments in shallow water and on muddy banks, and often called " green j^ Fig. 208. Vaucheria geminata, a Siphon form, showing a portion of the ccenocytic body (A) which has sent out a branch at the tip of which a sporangium (B) formed, within which a large zoospore was organized, and from which (B) it is discharged later as a large mnlticiiiate body (C), which then begins the develop- ment of a new ccenocytic body (13).—Caldwell. ; The filament is very long, and usually branches ex- tensively, but its great peculiarity is that there is no parti- tion wall in the whole body, which forms one long continuous cavity (Fig. 208). This is sometimes spoken of as a one- celled body, but it is a mistake. Imbedded in the exten- sive cytoplasm mass, which fills the whole cavity, there are not only very numerous chloroplasts, but also numerous nuclei. As has been said, a single nucleus with some cyto-. 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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