. Botany for high schools and colleges. Botany. 324 BOTANY. 296.—Closely related to Hydrodidyon is Pediastrum (Fig. 151),w}iich consists of a number of cells arranged into a flat, thallus-like mass. The cells at a certain stage produce, by. Fig. 16t.—A, a colony of cells constitnting a so-called iDdividnal of Pedia8i7nim> granulatum; t, cells with their contents remaining; the white cells are empty, their contents having escaped by the slits ap: p, contents of a cell (macrozoogonidia) escaping. 5, macrozoogonidia gr, in the motile state, enclosed in the membrane 5. C> the macrozoogonidia
. Botany for high schools and colleges. Botany. 324 BOTANY. 296.—Closely related to Hydrodidyon is Pediastrum (Fig. 151),w}iich consists of a number of cells arranged into a flat, thallus-like mass. The cells at a certain stage produce, by. Fig. 16t.—A, a colony of cells constitnting a so-called iDdividnal of Pedia8i7nim> granulatum; t, cells with their contents remaining; the white cells are empty, their contents having escaped by the slits ap: p, contents of a cell (macrozoogonidia) escaping. 5, macrozoogonidia gr, in the motile state, enclosed in the membrane 5. C> the macrozoogonidia arranging themselves in a colony, still enclosed by the mem- brane 6. X 400.—After Braun. internal cell-division, a large number of daughter-cells, which are of two sizes. The function of the smaller ones is un- o 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 gi'ow together, and thus form a colony like the parent one. 297. — In Cladophora (one of the common Confervacess) the cells of the branching filaments break up into ciliated zoospores which dirfectly. 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 E. (Charles Edwin), 1845-1915. New York : H. Holt
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