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Abstract
Eight species of Phoma and Ascochyta are described and contrasted. Diplodina cannabicola, Diplodina parietaria f. cannabina, Erysiphe communis var. urticirum, Phyllosticta cannabis, and Ascochyta cannabis become synonyms of Phoma cannabis, comb. noru. (≡ Depazea cannabis). Other Phoma species on Cannabis include P. exigua (= P. herbarum f. cannabis, Plenodomus cannabis), P. herbarum, P. glomerata, and P. piskorzii. Ascochyta arcuata, sp. nov. is described as the anamorph of Didymella arcuata. Ascochyta prasadii and Ascochyta cannabina are also described. Didymella arcuata is contrasted with D. cannabis. The pathogen complex is compared to one involving a related host, stinging nettles, Urtica dioica. Host range and geographic distribution of the eight fungi are discussed.
