. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ow that Sphserocystis (Chodat, 1902) should be regardedas synonymous with Ghvococcus (A. Braun, 1851), but Chodat (04) has rightly contested thissuggestion. The microscopic limnetic colonies of Sph&rocystis have nothing whatever incommon with Brauns description of the macroscopic colonies of Glceococctis, which must beplaced in the category of genera dubia. Willes reference of the genus to the Chlamydomonadeas(Wille, 03; 09) is also erroneous
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ow that Sphserocystis (Chodat, 1902) should be regardedas synonymous with Ghvococcus (A. Braun, 1851), but Chodat (04) has rightly contested thissuggestion. The microscopic limnetic colonies of Sph&rocystis have nothing whatever incommon with Brauns description of the macroscopic colonies of Glceococctis, which must beplaced in the category of genera dubia. Willes reference of the genus to the Chlamydomonadeas(Wille, 03; 09) is also erroneous since the dominant vegetative phase is non-motile, and theexperience of the present author is that a motile phase may be absent for very numerousgenerations. Tetrasporese 187 Sub-family TETRASPORE/E. The Alga? comprised in this group are dis-tinguished from all other members of the Palmellacese by the possession of pseudocilia. These are motionless, functionless cilia, each mature cell being-provided with two or more. In Tetraspora the cells are largely grouped infours at the periphery of a more or less extensive (macroscopic) mucilaginous mt. H Fig. 113. A—G, Schizochlamys flelatinosa A. Br. A, vegetative cell showing pseudocilia,y. 625; B, cell showing ecdysis of outer layers of wall, x 415 ; C and D, formation ofzoogonidia, x 625 ; E, zoogonidium, x 830; F and G, zoogonidium changing to Schizo-chlamys-cell, x 830. H and I, Apiocystis Brauniana Nag. H, pear-shaped colony, x 430 ;I, three cells showing pseudocilia, b, two daughter-cells from a division, the second pseudo-cilium not yet developed, x 860. J, Tetraspora gelatinosa (Vauch.) Desv., periphery ofcolony showing a few of the cells with their pseudocilia, x about 900. cv, contractilevacuole; n, nucleus; ol, oil globule; , pseudocilia; pij, pyrenoid ; st, stigma (orpigment-spot). (A—G, after Scherffel; J, after Chodat.) colony. The cells multiply by repeated division, chiefly in two directions inone plane
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