COMPARATIVE-STUDIES OF CRYPTOSPORIOPSIS-CURVISPORA AND C-PERENNANS .2. CYTOLOGY AND VEGETATIVE COMPATIBILITY

Cryptosporiopsis curvispora, cause of apple anthracnose, and C. perenn ans, cause of perennial canker, were indistinguishable in gross cytolo gy; macroconidia, microconidia, phialides and hyphal cells of each spe cies were mostly uninucleate. Complementation of nitrate-nonutilizing mutants occurred within and between isolates of each species but not b etween species. Such complementations were common within and between i solates of C perennans but rare within and between isolates of C curvi spora. The two fungi are considered to be distinct species. The teleom orph of C perennans is transferred to Pezicula as P. perennans comb. n ov.