. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 241. Three stages in the cell-division of(Edogonium Borisianum (Le Cl.) Wittr. x about620 (after Him). there are no pyrenoids, but large numbers of small starch grains (fig. 240 B),and in the autumn the cells of many species of (Edogonium are frequentlypacked with moderately large starch-grains. Many of the cells in a filamentof (Edogonium may exhibit trans-verse striations at their upperextremities. This feature, whichis most obvious in
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 241. Three stages in the cell-division of(Edogonium Borisianum (Le Cl.) Wittr. x about620 (after Him). there are no pyrenoids, but large numbers of small starch grains (fig. 240 B),and in the autumn the cells of many species of (Edogonium are frequentlypacked with moderately large starch-grains. Many of the cells in a filamentof (Edogonium may exhibit trans-verse striations at their upperextremities. This feature, whichis most obvious in the largerspecies, is due to a succession of apical caps resulting from re-peated cell-division (fig. 240 D). Growth is not apical, but for themost part intercalary, and any cellexcept the basal one may details of cell-division havebeen worked out by various authorsand notably in recent years by Hirn(00) and Kraskovits (05). It ispreceded by the division of thenucleus, during the mitosis ofwhich there is formed an intra-nuclear spindle. At this period there arises a ring-like thickening on theinner side of the wall at the apex of the c
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