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ABSTRACT
Cryptosporiopsis curvispora, cause of apple anthracnose, and C. perennans, cause of perennial canker, were indistinguishable in gross cytology; macroconidia, microconidia, phialides and hyphal cells of each species were mostly uninucleate. Complementation of nitrate-nonutilizing mutants occurred within and between isolates of each species but not between species. Such complementations were common within and between isolates of C. perennans but rare within and between isolates of C. curvispora. The two fungi are considered to be distinct species. The teleomorph of C. perennans is transferred to Pezicula as P. perennans comb. nov.