. Fresh-water biology. Freshwater biology. 142 FRESH-WATER BIOLOGY 60 (64) In conjugating the whole of the contents of the conjugating oells passes into the zygospore. Subfamily Zygnemeae . 61 61 (62, 63) Chromatophores two, axial, star-shaped; a pyrenoid in the center of each Zygnema da Bary. Conjugation either ladder-like or lateral: Zygospore within one of the conjugating cells, or in the conjugating tube. According to Collins aplanospores may take the place of zygo- spores, also resting akinetes with granular contents and thickened membrane may be fovmd. Fig. 137. Zygnema sp. X 600. (Origi
. Fresh-water biology. Freshwater biology. 142 FRESH-WATER BIOLOGY 60 (64) In conjugating the whole of the contents of the conjugating oells passes into the zygospore. Subfamily Zygnemeae . 61 61 (62, 63) Chromatophores two, axial, star-shaped; a pyrenoid in the center of each Zygnema da Bary. Conjugation either ladder-like or lateral: Zygospore within one of the conjugating cells, or in the conjugating tube. According to Collins aplanospores may take the place of zygo- spores, also resting akinetes with granular contents and thickened membrane may be fovmd. Fig. 137. Zygnema sp. X 600. (Original.) 62 (61, 63) Chromatophore one to several parietal, spiral bands, with many pyrenoids Spirogyra Link. Conjugation ladder-like or lateral. Zygospore in one of the conjugating cells. Parthenospores may be Fig. 138. S^Vogyra crassa KUtzing. u. conjugation of filaments. 5. zygospores X 100. (Original.) 63 (61, 62) Chromatophore an axial plate, with several pyrenoids. Debarya Wittrock. Cells long; conjugation ladder-like; zygospore between the con- jugating cells; the middle layer of the spore membrane yellow, with three parallel longitudinal grooves, connected by radial striations. Fig. 139. Debarya glyplosperma Wittrock, showing two zygospores. X o?. (After de Bary.) 64 (60) In conjugation only a portion of the contents of the conjugating cells passes into the zygospore. Subfamily Mesocarpeae . 6s. 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 Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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