PYRENOPHORA PHAEOCOMES (REB. EX FR.) FR.

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Abstract
The history of Pyrenophora Fr. was reviewed with special reference to Pleospora Rab. It was concluded that the two genera are distinct. The following characteristics were found to be of diagnostic value for Pyrenophora: ascocarps very large, sclerotioid, slow-maturing, usually setose, occurring on grasses; ascospores large, nearly cylindrical with rounded ends, with 3–5–7 transverse septa, and a longitudinal septum in from one to all cells depending on species. In addition, the known conidial states of Pyrenophora were noted to be species of the hyphomycete genus Drechslera Ito.An authenticated specimen of P. phaeocomes from the Fries Herbarium was used as a neotype in the apparent absence of Rebentisch's specimen. Numerous ascospores were found among the immature ascocarps on the leaves, and taken as evidence that the fungus is an ascomycete. The conidial-state association was tenuously confirmed by the presence of one Drechslera conidium. It was concluded that the name Pyrenophora can be used for the genus of ascomycetes typified by P. phaeocomes.