. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 235. A, germination of zygospore of Mesotsenium chlamydosporum De Bary, showing fourembryos, x 390 (after De Bary). B and C, germination of zygospore of ; B, with four embryos; (7, with two embryos, x 390 (after De Bary).D—I, germination of zygospore of Mesotsenium caldariorum (Lagerh.) Hansg., x 500 ; D—G,the usual germination with the formation of two embryos ; H and I, the exceptionalgermination with

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. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 235. A, germination of zygospore of Mesotsenium chlamydosporum De Bary, showing fourembryos, x 390 (after De Bary). B and C, germination of zygospore of ; B, with four embryos; (7, with two embryos, x 390 (after De Bary).D—I, germination of zygospore of Mesotsenium caldariorum (Lagerh.) Hansg., x 500 ; D—G,the usual germination with the formation of two embryos ; H and I, the exceptionalgermination with the formation of four embryos. J, zygospore of Desmidium cylindricumGrev., x500. In many cases conjugation takes place immediately after vegetative division and beforethe young sernicells have arrived at maturity, the conjugation actually occurring betweenthe two daughter-cells which have resulted from the division of the original present author has observed this to take place in Micrasterias denticulata, Peniumdidymocarpuin (vide figs. 233 L and 234 D and E and several species of Closterium), and thesame phenomenon was observe

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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambridgeengtheuni