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Abstract: The Australian mushroom industry currently produces one variety of mushroom - Agaricus bisporus (Lange) Sing. There has been a significant increase in the demand for mushrooms in this country (Australian Mushroom Growers' Association - communication) and it was thought worthwhile to investigate the possibility of culturing another variety - the oyster mushroom (Pleurotus sajor caju Fr.) to satisfy this demand. P. sajor-caju was cultivated by Jandaik (1974) using mxitures of paddy straw, hulled maize cobs, banana pseudostem and oatmeal. Recent work by Zadrazil (1980) demonstrated that this fungus has a very high saprophytic colonizing ability and can degrade wheat straw. Chang et al. (1981) devised a new method for its cultivation on a relatively large scale using cotton waste from Hong Kong textile industry. Although Australia produces cotton, textile waste is not available because of differences in technology. In this paper we describe the use of cotton seed hulls (a waste product of cotton seed oil mills) as a substrate for the cultivation of P. sajor-caju and present preliminary findings on the environmental factors affecting growth of the fungus mycelium in vitro.
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