Abstract
Eight isolates of chytrids from soil were compared in culture. On pine pollen they initially appeared similar but in pure culture marked differences in rhizodial morphology were noted. One isolate is proposed as neotype material for Rhizophydium sphaerotheca Zopf. The others are described as four new species: R. capillaceum, Phlyctochytrium californicum, P. plurigibbosum, and P. acuminatum.

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