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Observations on morphology and the response of hyphae to temperature by Australian and French isolates of Lepista

The development of viable commercial cultivation techniques for the edible fungus Lepista nuda (Bull.: Fr.) Cooke is necessary to expand the range of species available to the exotic/wild mushroom growing industry in Australia. This study provides new data on the effect of temperature on hyphal growth of Australian isolates of Lepista. Wild Lepista were collected from selected cool (4-25°C during growing season) and warm (8-35°C during growing season) climatic regions in Australia and pure vegetative cultures isolated. These collections differed morphologically from overseas isolates but whether these are new species or varieties or the result of environment and habitat has yet to be determined. The optimum temperature parameters for hyphal growth were determined and comparisons made with French cool (average day temperature 11°C ) and warm (average day temperature 14°C ) climatic region isolates. The range of temperatures for the mycelial growth of Australian and French isolates in vitro was 5-35°C and 5-30°C respectively. The growth rate of Australian isolates was more than double that of French isolates at the optimum temperatures.