A New Species of Pythium with Spiny Oogonia and Large Chlamydospores

Abstract
SUMMARY Pythium dimorphum, a new species, is characterized by oogonia partially to completely covered with blunt irregularly spaced projections averaging 3 μ in length and aplerotic to nearly plerotic oospores averaging 30 μ diam. Antheridia may be hypogynous or monoclinous but are frequently absent. Prominent ovoid to elongate thin-walled, spherical chlamydospores averaging 64 μ in diam with dark contents are a distinguishing feature of this fungus. Ovoid or club-shaped sporangia, averaging 28 × 54 μ, are present.

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