. Fresh-water biology. Freshwater biology. Cells disc-shaped, each cell-half with three or five lobes, the lateral ones of which are more or less deeply cut. Micrasterias Agsudh. Cells broadly oval or rounded in out- line. Middle constriction deep, some- times furnished with spines; lateral lobes often one or more times dichotomously divided, the last divisions usually fur- nished with spines. Chromatophore the form of the cell, in which are scattered several pyrenoids. Fro. 129. Micrasterias papillifera Brebisson. One haJf of a cell. X 365- (Original.) 47 (46) Cells at ends with an incision o
. Fresh-water biology. Freshwater biology. Cells disc-shaped, each cell-half with three or five lobes, the lateral ones of which are more or less deeply cut. Micrasterias Agsudh. Cells broadly oval or rounded in out- line. Middle constriction deep, some- times furnished with spines; lateral lobes often one or more times dichotomously divided, the last divisions usually fur- nished with spines. Chromatophore the form of the cell, in which are scattered several pyrenoids. Fro. 129. Micrasterias papillifera Brebisson. One haJf of a cell. X 365- (Original.) 47 (46) Cells at ends with an incision or undulation, end view elliptical with one or two prominences on the sides. . Euastrum Ralfs. Cells oblong or elliptical, with deep, middle constriction, and variously incised, concave, or undulating margins. End view oval, with one or more rounded projections. Membrane some- times with warts or spmes. Chromatophore axial. Fig. 130. Euastrum elegans Kiitzing. X 588. (Original.) 48 (45) Cells at ends without notches or linear incisions 49 49 (54) Cells without spines 5° 50 (51) Cells free . Cosmarium Corda. Cells elhptical or circular, sometimes with more or less imdulating or tapering margins; middle constriction deep and linear; end view oval or circular, often with rounded projec- tions Chromatophore in each cell-half, usually of radiating plates about one or more pyrenoids; membrane often punc- tate or with minute 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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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
