Geosmithia Pitt is erected to accommodate species, previously placed in Penicillium, with the following combination of characters: colonies with conidia in colors other than grey–blue or grey–green, penicilli with all elements roughened, and with both phialides and conidia cylindroidal. Geosmithia lavendula (Raper & Fennell) Pitt, G. putterillii (Thom) Pitt, G. namyslowskii (Zaleski) Pitt, G. cylindrospora (G. Smith) Pitt, G. argillacea (Stolk, Evans & Nilsson) Pitt, and G. emersonii (Stolk) Pitt are described as new combinations; G. swiftii is a new species for the anamorphic state of Talaromyces bacillisporus (Swift) C. R. Benjamin. A key is provided.
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John I. Pitt (1979) studied this question.
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