SUMMARY: The relationship between various parameters of growth of on solid media in tubes is described. These are () the relationship between culture weight and linear growth rate on various media; () the relationship between ‘lag’ in growth and inoculum size on various media. This latter relationship appears to obey a log law, enabling an inoculum doubling-time to be calculated. Adaptation of the arginine auxotroph -I (46004) to diminution of arginine in the medium first occurred by decrease in mycelial weight and then by decrease in linear growth rate. The inoculum doubling-time did not appear to vary systematically with arginine concentration.


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