A New Species of Pythium Isolated from Wheat beneath Snow in Washington

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Abstract
P. okanoganense differs from other members of the genus in having terminal oblate-spheroidal sporangia that infrequently proliferate internally to produce another sporangium within the old sporangial wall. Oogonia are smooth, except commonly a single, terminal hyphal protrusion extends from the oogonial wall. Antheridia are mostly single, frequently borne on inflated antheridial stalks, and monoclinous or less often diclinous. Oospores are aplerotic to nearly plerotic.

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