. Fresh-water biology. Freshwater biology. 181 (178, 179, 180) Cells club-shaped or elongated, forming a star. Actinastrum Lagerheim. Rays pointed, each ray composed of a single cell, all of which unite at the center. Chromatophore single, parietal, often not extending to the ends. Fig. 204. Actinastrum hantzschii Lagerheim. X 550. (Original.) 182 (177, 186) Cells in one plane 183 i83_(i84, 185) Cells four, eight, or sixteen in one or two parallel or zigzag rows Scenedesmus Meyen. The cells oval or pointed, the membrane either smooth or furnished with distinct spines at the ends. Chromatophore
. Fresh-water biology. Freshwater biology. 181 (178, 179, 180) Cells club-shaped or elongated, forming a star. Actinastrum Lagerheim. Rays pointed, each ray composed of a single cell, all of which unite at the center. Chromatophore single, parietal, often not extending to the ends. Fig. 204. Actinastrum hantzschii Lagerheim. X 550. (Original.) 182 (177, 186) Cells in one plane 183 i83_(i84, 185) Cells four, eight, or sixteen in one or two parallel or zigzag rows Scenedesmus Meyen. The cells oval or pointed, the membrane either smooth or furnished with distinct spines at the ends. Chromatophore single, parietal, with an opening at one side and a pyrenoid. This is one of the most common and the best known of all of the lower algae, it being found in almost all localities where algae are ever found. Its adaptation to various environments, and to conditions unfavorable to most othe** algae, accounts for its wide distribution. Fig. 20s. Scenedesmus gtiadricauda'Bi6h. X 585. (Original.). 184 (183, 185) Cells grouped in fours, forming a rectangular plate of sixteen or more cells Crucigenia Morren. Cells spherical or elongated. Chromatophore thin, parietal, with a circular opening and one pyrenoid. This is regarded by Schmidle as Staurogenia Fig. 206. Crucigenia apiculata Chodat. X looo. (Oiiginal.). 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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