. Botany for high schools and colleges. Botany. 224 BOTANY. 296.—Closely related to Hydrodictyon is Pediastrum (Fig. 151),which consists of n number of cells arranged into a flat, thallus-like mass. The cells at a certain stage produce, by. Fig. 151.—A. a colony of cells constituting a so-called individual of Pediastrum, granulatwm ; t, cells with their contents remaining ; the white cells are empty, their contents having escaped by the slits sp: g, contents of a cell (macrozoogonidia) escaping B, macrozoogonidia g, in the motile state, enclosed in the membrane b. (7, the macrozooifonidia arra
. Botany for high schools and colleges. Botany. 224 BOTANY. 296.—Closely related to Hydrodictyon is Pediastrum (Fig. 151),which consists of n number of cells arranged into a flat, thallus-like mass. The cells at a certain stage produce, by. Fig. 151.—A. a colony of cells constituting a so-called individual of Pediastrum, granulatwm ; t, cells with their contents remaining ; the white cells are empty, their contents having escaped by the slits sp: g, contents of a cell (macrozoogonidia) escaping B, macrozoogonidia g, in the motile state, enclosed in the membrane b. (7, the macrozooifonidia arranging themselves in a colony, siill enclosed by the mem- brane b. X 400.—After Brauii. internal cell-division, a large number of daughter-cells, which are of two sizes. The function of the smaller ones is un- known ; the larger ones (macrozoogonidia) escape by a slit in the wall of the mother-cell, surrounded by a thin membrane, in which they swim freely for a time (Fig. 151 B). After a while they lose their pow- er of motion and arrange themselves symmetrically, as in C, Fig. 151. They soon grow together, and thus form a colony like the parent one. 297. — In Cladopliora (one of the common Confervaceae) the cells of the branching filaments break up into ciliated zoospores which directly. 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
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