Abstract
The resting spore of Phlyctochytrium planicorne enlarges within a resting sporangium, distends it and discharges endogenously cleaved planonts which cluster at the orifice. In P. aureliae the resting spore functions directly as a sporangium and the endogenously cleaved planonts swim at once upon release. The thallus form of Nowakowskiella elegans is influenced by substratum but resting spore development and discharge pattern are identical in all forms. The resting spore functions as an operculate sporangium or a prosporangium; planonts are cleaved endogenously or in part exogenously, and cluster at the orifice before swimming. N. crassa, N. delica and N. profusa are reduced to synonymy under N. elegans.

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