. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 131. A—I), Srlenustnimgracile Reinsch. E—G, Lagerh. Allx 520. 204 TetrasporinesB The genera are : Ankistrodesmus Corda, 1838 ; em. Ralfs, 1848 [inclus. RhaphidiumKtttzing, 1845 ; Schroderia Lemmermann, 1898]; Selenastrum Reinsch, 1867 ; ActinastrumLagerheim, 1882 ; Reinschiella De Toni, 1889 [ = Clostridium Reinsch, 1888]; KirchneriellaSchmidle, 1893 [inclus. Selenoderina Bohlin, 1897] ; Closteriopsis Lemmermann, 1898;Lauter
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 131. A—I), Srlenustnimgracile Reinsch. E—G, Lagerh. Allx 520. 204 TetrasporinesB The genera are : Ankistrodesmus Corda, 1838 ; em. Ralfs, 1848 [inclus. RhaphidiumKtttzing, 1845 ; Schroderia Lemmermann, 1898]; Selenastrum Reinsch, 1867 ; ActinastrumLagerheim, 1882 ; Reinschiella De Toni, 1889 [ = Clostridium Reinsch, 1888]; KirchneriellaSchmidle, 1893 [inclus. Selenoderina Bohlin, 1897] ; Closteriopsis Lemmermann, 1898;Lauterborniella Schmidle, 1900 ; Desmatractum W. & G. S. West, 1902 ; DldymogenesSchmidle, 1905 ; Scenedesmus Meyen, 1829 ; Dacti/lococcus Niigeli, 1849 (in part)[= Ouracoccus Grobety, 1909]; Tetradesmm Smith, dat. All x 520. Sub-family The Algtr of this small group consist of colonies of few or many cells arranged withmuch regularity in the form of a flat cells vary much in outward form, but aremostly somewhat rounded and never elongateas in the Selenastrese. Four autospores arisein each mother-cell. They are disposed in oneplane, and in certain species of Crucigenia (, fig. 132 A, and C. Tetrapedia,fig. 132 F) colonies of considerable size (128Fig. 132. A—C, Crucigenia rect- cells) may be formed by the conversion into angularin (Nag.) Gay. D ami mucjiaae of the walls of the mother-cells ofE, C. quadrant Morren. 1< , C. Tetrapedia (Kirchn.) W. & G. S. successive generations. In other species ot Crucigenia (C. quadrata, C. Lauterbornii, etc.)the colonies never become very large, and con-sist mostly of from 4 to 16 cells. Even in the large colonies the cells remain in distinct groups of four, and there is alwaysa quadrate or rhomboidal space
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