. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 232. I, diagrammatic scheme depicting four generations (A, B, C and D) in the usualtype of Closterium; s, sl5 «2 an(i ss refer to the semicells of successive generations. II,similar scheme depicting three generations of the type of Closterium 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, sj and s2 re
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 232. I, diagrammatic scheme depicting four generations (A, B, C and D) in the usualtype of Closterium; s, sl5 «2 an(i ss refer to the semicells of successive generations. II,similar scheme depicting three generations of the type of Closterium 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, sj and s2 refer tosemicells, and g, g1 and g-2 to girdle bands of successive generations. Ill and IV, Closteriumlurijidnm Ehrenb. var. giganteum Nordst., xl200; IV, surface view of the median part ofthe cell; III, 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 LiitkemiUler.) 02). The girdle-bands (or intercalary bands) are not comparable with thoseof Diatoms (consult p. 119). Asexual reproduction takes pl
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