Abstract
1. The optimum vegetative growth of Aspergillus niger, as attested by the growth in diameter of the colony and the total dry weight of the mycelium, occurred at 30⚬ C., while optimum spore production ranged from 30⚬ to 35⚬. The appearance of the colony and spores at 35⚬ varied greatly from that at the other temperatures. 2. Both Penicillium italicum and Rhizopus nigricans grew best at 25⚬ C. In the latter, optimum sporulation also occurred at this temperature, but, in the former, spore production was more pronounced at 30⚬. R. nigricans exhibited extremely poor growth at 30⚬ and no growth at 35⚬. P. italicum grew well at 30⚬ but very poorly at 35⚬. The appearance of the colony at the latter temperature differed radically from that at the lower temperatures. 3. Spores of A. niger and R. nigricans, which did not germinate or showed poor germination at relatively high temperatures, produced profuse mycelia when transferred to temperatures conducive to optimum vegetative growth. At 35⚬ C. spores of R. nigrica...
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