“…All of the fourteen groups into which the genus has been classified (Thorn & Raper, 1945) include one or more antibiotic-producing species (Brian, 1951). In the large Aspergillus glaucus group, nine species have previously been shown to produce antibacterial substances (Wilkins & Harris, 1942Gill-Carey, 1949 ;Furtado, 1944;Gupta & Viswanathan, 1955) and A. amstelodami can be added as a further example. Gill-Carey (1949) examined a strain of A. amstelodami and did not observe antibiotic activity, but this may illustrate the general principle that antibioticproduction is a strain, rather than a species, characteristic (Wilkins & Harris, 1945).…”