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SUMMARY
A new species, Aspergillus bisporus, isolated from soil collected at Clarksburg, Maryland, and Bainbridge, Georgia, is described. On standard media the species is characterized by conidial heads with uniseriate phialides bearing short chains of large, globose, black, coarsely dentate conidia and more specifically by the production of two conidial forms on high-sugar medium. The second type of conidial structure developed on M40Y agar bears long, light-olivish conidial chains consisting of smooth to slightly rough, globose to elliptical conidia. Incubation at 37–45 C enhances the development of the second conidial form.
Conidia of A. bisporus survive for several months in brain, lung, liver and spleen of mice without any evidence of multiplication. However, extensive growth causing chronic nephritis occurs in the kidney.