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SUMMARY
Sixteen members of the Penicillium luteum series, representing 10 species and including 5 typical strains of P. luteum Zukal, have been analyzed by means of mono-ascospore isolates. All were found to be homothallic. Other species under investigation included P. avellaneum Thom and Turesson, P. bacillosporum Swift, P. helicum, P. rotundum, and P. striatum Raper and Fennell, P. spiculisporum Lehman, P. stipitatum Thom, P. vermiculatum Dangeard and P. wortmanni Klöcker. The singular nature of Derx's results, wherein P. luteum was reported to be heterothallic (1925 and 1926), is discussed.