The taxonomy and heterothallism of Pythium sylvaticum

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Abstract
Thirty-five of 83 Pythium isolates from Indiana were identified as P. sylvaticum by the production of sexual reactions and mature oospores in matings with the male and female type cultures of that species. Revised and expanded taxonomic descriptions of P. sylvaticum are presented. P. sylvaticum appears to be synonymous with P. debaryanum var. pelargonii. All P. sylvaticum isolates could be placed in heterothallic male or female groups. Many isolates were also homothallic. The mating system of P. sylvaticum does not represent sexual dimorphism because some isolates of the male group produced heterothallic sexual reactions in paired matings. Variations in sexual reactions indicate that P. sylvaticum comprises male and female isolates which differ in sexual strength.

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