. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . D Fig. 204. Wittrockiellaparadoxa Wille. A, vegetative thread with short branches ; B, germinatingakinete which has developed a hair-cell; (7, single cell fixed and stained to show the reticulatechloroplast with many pyrenoids (with double contours and seven nuclei (darkly shaded));D, formation of aplanospores ; E, formation of a large akinete. A and B, x 123 ; G. x 530 •D and E, x 240 (after Wille). layers of the cell-walls. The branches are
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . D Fig. 204. Wittrockiellaparadoxa Wille. A, vegetative thread with short branches ; B, germinatingakinete which has developed a hair-cell; (7, single cell fixed and stained to show the reticulatechloroplast with many pyrenoids (with double contours and seven nuclei (darkly shaded));D, formation of aplanospores ; E, formation of a large akinete. A and B, x 123 ; G. x 530 •D and E, x 240 (after Wille). layers of the cell-walls. The branches are few, often unicellular, and theyarise from the upper ends of the cells. Numerous thalli are agglutinatedto form a cartilaginous stratum on ground which is inundated by salt orbrackish water. The cells are mostly inflated, generally globose or ellipsoid,rarely subcylindrical, and often rather irregular. The longest cells are thosein the basal part of the stratum and from these cells branches grow down-wards to form multicellular rhizoids. From the upper cells hairs aredeveloped. These attain a considerable length, extending beyond the 312 Ulotri
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambridgeengtheuni
