NOTES ON HYPHOMYCETES .69. CONCERNING SPORIDESMIUM-MACLURAE AND ITS SYNONYM CERCOSPORA-MACLURAE, THE CAUSAL ORGANISM OF LEAF-BLOTCH OF OSAGE-ORANGE (MACLURA-POMIFERA), RECLASSIFIED IN PSEUDOCERCOSPORA

Sporidesmium maclurae Thum., the causal organism of leaf-blotch of osa ge-orange, is redescribed and illustrated from its type material and f rom fresh collections made in Alabama, where it is of common occurrenc e. The fungus is reclassified in the genus Pseudocercospora Speg., as P. maclurae (Thum.) Morgan-Jones & Phelps, being closely similar to it s type species, P. vitis (Lev.) Speg. Comments are made on the heterog eneity of Pseudocercospora as presently constituted. Cercospora maclur ae Ell. & Everh. is considered to be a synonym of P. maclurae.