. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 10. End of trichome ofCylindrospermum sp. showingthe terminal heterocyst andspore furnished with hair-likeprocesses, and the gelatinoussheath frayed around theheterocyst. The protoplas-mic connections are alsoshown through the commu-nicating pores in the end-walls of the cells. Very highlymagnified (after Phillips). HETEROCYSTS. In the filamentous families of the Nostocaceas, Scytone-maceas, Stigonemacese, and Rivulariacese, there are ce
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 10. End of trichome ofCylindrospermum sp. showingthe terminal heterocyst andspore furnished with hair-likeprocesses, and the gelatinoussheath frayed around theheterocyst. The protoplas-mic connections are alsoshown through the commu-nicating pores in the end-walls of the cells. Very highlymagnified (after Phillips). HETEROCYSTS. In the filamentous families of the Nostocaceas, Scytone-maceas, Stigonemacese, and Rivulariacese, there are certain differentiatedcells known as heterocysts. They may be sparsely scattered in an intercalary Heterocysts 17 manner between the vegetative cells of the filament (hg. 11 C), or theymay be terminal (fig. 11 F and G), Sometimes they are seriate as insome species of Tolypothrix, Calothrix, Nostoc, etc. As a rule, they area little larger than the vegetative cells, and in most cases stand outconspicuously among the other cells of the filament. There is almost.
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