. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . 456 Fig. 236. Germination of the zygospore of Closterium sp. 1, zygospore just before germination,the nuclei of the gametes not having yet fused ; 2, the first mitosis of the fusion-nucleus;3, first division of nucleus completed; 4, the second mitosis ; 5, completed division ofprotoplast into two cells, each showing a large nucleus and a small nucleus; 6, furtherstage in germination, the cells beginning to assume a definite shape. All x 308.
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . 456 Fig. 236. Germination of the zygospore of Closterium sp. 1, zygospore just before germination,the nuclei of the gametes not having yet fused ; 2, the first mitosis of the fusion-nucleus;3, first division of nucleus completed; 4, the second mitosis ; 5, completed division ofprotoplast into two cells, each showing a large nucleus and a small nucleus; 6, furtherstage in germination, the cells beginning to assume a definite shape. All x 308. (AfterKlebahn, from Oltmanns.) Klebahn (90) has observed the formation and germination of parthenospores in aspecies of Cosmarium, and Borge (13) has also noted the production of parthenospores inabortive attempts at conjugation in Cylindrocystis Brebissonii Menegh. The zygospore rests for some time before germination. The first obser-vations of importance on the germination of the zygospore were those ofDe Bary (58), and further details with regard to certain genera have beenfurnished by Millardet (70) and especially by Klebahn (90). The nuclei o
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