Further Observations on the Sporulation of Chuetomium glo bosum

SUMMARY: Extracts of a strain of Aspergillus fumigatus stimulate fruiting of Chuetomium globosum, but the factor responsible is not identical with that present in jute extract. Hexose phosphates, although stimulating fruiting, do not account for the activity of the jute extract. Buston & Basu (1948) reported the presence in extracts of jute of a substance which markedly stimulated perithecial formation of Chaetomiurn globosum Kunze, and showed that the stimulant was not identical with any of the recognized members of the vitamin B complex. Later, Basu (1951) found that the effect was in part due to the presence of calcium in the extracts. Buston & Basu (1948) also examined the influence of a number of other micro-organisms grown in association with C. globosurn, but in no case observed any stimulation of fruiting. Later, a chance contaminant of a plate culture of C. globosum was found markedly to promote sporulation, the organism responsible being identified as a strain of Aspergillus fumigatus Fresen. From cultures of this organism, extracts were obtained having an effect similar to that produced b