Abstract
alga was again collected in December, 1940, and the same extensive akinete formation was found as in the previous year. The purely vegetative filaments are 30-5 I / in diameter and display extensive dichotomous branching, the branching being radially arranged. Sex organs are very rarely formed and are borne at the ends of comparatively long branches, as in CHAPMAN'S longistipitata variety of V. geminata described from Urbana, Ohio (i). The interest of this form lies in its extensive akinete formation. This mode of propagation is so common in this alga that it has practically displaced the sexual
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