. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 232. J, diagrammatic scheme depicting four generations (A, B, C and D) in the usualtype of Clostcrium; s, Sj, s2 and s3 refer to the semicells of successive generations. II,similar scheme depicting three generations of the type of Clostcrium which develops a girdle-band ; A, B and C, cells of successive generations immediately after cell-division; A*, B*and C*, corresponding generations after development of girdle-bands; s, «j and s% ref
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 232. J, diagrammatic scheme depicting four generations (A, B, C and D) in the usualtype of Clostcrium; s, Sj, s2 and s3 refer to the semicells of successive generations. II,similar scheme depicting three generations of the type of Clostcrium which develops a girdle-band ; A, B and C, cells of successive generations immediately after cell-division; A*, B*and C*, corresponding generations after development of girdle-bands; s, «j and s% refer tosemicells, and g, g\ and g-2 to girdle bauds of successive generations. Ill and IV, Closteriumturgldum Ehrenb. var. giganteum Nordst., x!200; IV, surface view of the median part ofthe cell; 771, longitudinal section of same; r, the ring-furrow in the middle of the cell;t and t, short transverse segments of cell-wall, resulting from cell-divisions, showing thebevelled sutures. (All modified from Lutkemuller.) 02). The girdle-bands (or intercalary bands) are not comparable with thoseof Diatoms (consult p. 119). Asexual reproduction takes place
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