Abstract
A number of variants derived from a zoospore isolate of Phytophthora cactorum are described, and their colony characteristics, morphology of vegetative hyphae, and size, appearance, and frequency of reproductive organs are compared. The variants have been maintained to some extent on germination of single zoospores and oospores. While no means has been found of controlling these changes by altering environmental conditions, there is a connexion between variation and ageing, reversion to the original form having occurred in old cultures of all the variants.
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