. The cell in development and inheritance. Cells; Cells. Fig. 85. — Conjugation of Spirogyra. [OvERTON.] A. Union of the conjugating cells (^S. communis). B. The typical, though not invariable, mode of fusion in 6'. Weberi ; the chromatophore of the "female" cell breaks in the middle, while that of the " male " cell passes into the interval. C. The resulting zygospore filled with pryrenoids, before union of the nuclei. D. Zygospore after fusion of the nuclei and formation of the membrane. features. Here the conjugating cells completely fuse to form a "zygospore" (
. The cell in development and inheritance. Cells; Cells. Fig. 85. — Conjugation of Spirogyra. [OvERTON.] A. Union of the conjugating cells (^S. communis). B. The typical, though not invariable, mode of fusion in 6'. Weberi ; the chromatophore of the "female" cell breaks in the middle, while that of the " male " cell passes into the interval. C. The resulting zygospore filled with pryrenoids, before union of the nuclei. D. Zygospore after fusion of the nuclei and formation of the membrane. features. Here the conjugating cells completely fuse to form a "zygospore" (Figs. 85, 99), which as a rule becomes surrounded by a thick membrane, and, unlike the animal conjugate, may long remain in a quiescent state before division. Not only do the nuclei unite, but in many cases the plastids also (chromatophores). In Spirogyra some interesting variations in this regard have been observed. In some species De Bary has observed that the long band-shaped chro- matophores unite end to end so that in the zygote the paternal and. 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 Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York : The Macmillan company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcells, bookyear1896
