Über Hydrianum viride ( Characiaceae, Chlorophyceae), seine fortpflanzung und taxonomie.

The little known epiphytic alga Hydrianum viride was studied and pictured. The morphology and the variability of the vegetative cells are described in detail and compared with the observations of other authors. For the first time typical biflagellate zoospores of the chlorophycean-type have been recognized and the course of the asexual reproduction is studied. The residual protoplasm, that is the proximal half of the zoosporangium protoplast, growth up to the original size, typical for the genus Hydrianum. The life cycle, especially the settling down of the zoospores, is described. Hydrianum viride belongs to the characteristic inhabitants of peaty waters; it belongs together with the host alga, Microspora loefgrenii, to the dominants of algal association of peat-springs. At last the taxonomic position and the synonyma of this organism are discussed. [ABSTRACT FROM AUTHOR]