Monocillium humicola is described as a new hyphomycete and compared with Monocillium indicum, the type. The relationships between Monocillium and reduced forms of Paecilomyces are discussed. Paecilomyces variabilis is described as a new species from soil which has a reduced conidiophore apparatus consisting largely of sessile phialides; it produces an antibiotic active against both Gram-positive and Gram-negative bacteria but not against fungi.
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George Barron (1961) studied this question.