Useful key characters separating three Aspergillus taxa: A. sojae, A. parasiticus, and A. toxicarius.

Abstract
The presence or absence of metulae, the color of conidial heads, and the pink coloring of the conidia on Czapek agar slant cultures containing 0.05% anisaldehyde can be regarded as criteria and key characters by which to distinguish 3 taxa, i.e., A. sojae Sakaguchi et Yamada ex Murakami, A. parasiticus Speare and A. toxicarius Murakami. One (strain RIB 4018) of the A. toxicarius strains, producing no pink conidia, is now placed in A. parasiticus on the basis of the dark green color of conidial heads in age. A revised synoptic key is provided for the identificaiton of the yellow-green Aspergilli which produce roughened to echinulate conidia.

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