. Fresh-water biology. Freshwater biology. THE FRESH-WATER ALGAE 38 (37) Length of cells many times the breadth. . 139 39 39 (40, 41) Cells before the middle constriction swollen, but without longitu- dinal flutings; chromatophore of radially-placed plates, with pyrenoids Pleurotaenium Lundell. Cells straight, cylindrical, somewhat taper- ing toward the truncate ends. Membrane smooth or with small warts; at each end a FlO. 125. Pleurotaenium mdulosum Rabenhorst. colorless vacuole with dancing particles as in X 175- (Original.) Closterium. 40 (39, 41) Cells before middle constriction swollen an
. Fresh-water biology. Freshwater biology. THE FRESH-WATER ALGAE 38 (37) Length of cells many times the breadth. . 139 39 39 (40, 41) Cells before the middle constriction swollen, but without longitu- dinal flutings; chromatophore of radially-placed plates, with pyrenoids Pleurotaenium Lundell. Cells straight, cylindrical, somewhat taper- ing toward the truncate ends. Membrane smooth or with small warts; at each end a FlO. 125. Pleurotaenium mdulosum Rabenhorst. colorless vacuole with dancing particles as in X 175- (Original.) Closterium. 40 (39, 41) Cells before middle constriction swollen and with longitudinal flutings; chromatophores of longitudinal radial plates. Docidium Lundell. Cells tapering somewhat towards the ends; no vacuoles with moving granules; membrane either smooth or with minute protuberances and even with spines in certain regions. Fig. 126. Docidium baculum Brebisson. X 545. (Original.) 41 (39, 40) Shape of cells much as in Pleurotaenium, but apices broadly cleft or with bidentate processes Triploceras Bailey. Cells large, walls covered with rings of furcate processes or small, perpendicular longitudi- nally-placed plates. Sometimes confused with Docidium. Fig. 127. Triploceras gracile Bailey. One-half of a cell. (After Cushman.) 42 (34) Constrictions at the sides deep and abrupt 43 43 (44) End views of cells 3 to several angled or rayed. Staurastrum Lundell. Side view hour-glass shaped; membrane smooth or with warts or spines; chromatophores in each cell-half consisting of radially-placed plates about a central pyrenoid, two plates extendmg into each arm or angle. Fig. 128. Staurastrum crenulatum'i^HgAi. X 600. (Original.) 44 (43) End views of cells compressed or elliptical, often enlarged at the center 4S. 4S (48) Cells at end with notches or linear incisions. 46. 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 p
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
