Pathology, Morphology and Nuclear Cycle of Two New Species of Pyrenophora

Abstract
SUMMARY Two new species of Pyrenophora: Pyrenophora alternarina and P. secalis, with their conidial stages, are described. Pyrenophora alternarina is suggested as probably the first reference connecting the genus Pyrenophora with Alternaria. Pyrenophora secalis, with an Helminthosporium conidial stage, produces a severe leaf spot of rye seedlings. The developmental nuclear cycle of the fungus to the formation of multinucleate ascospores and conidia is described and figured.

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