Some cultural characteristics of mycelia of a mycorrhizal fungus, Lyophyllum shimeji

Cultural characteristics of 45 strains of Lyophyllum shimeji and 10 strains of three related species were determined. The average optimum temperature for mycelial growth of L. shimeji on a medium consisting of rye grains was 24.9°C, slightly higher than those for L. fumosum and L. decastes. The average mycelial growth rate of the L. shimeji strains, each at its optimum temperature, was 2.0 mm/day, almost the same as that of L. decastes and 2 times greater than those of L. semitale and L. fumosum. All strains of L. shimeji could grow on beech and pine sawdust, but none could significantly decompose beech wood blocks. Of the 45 strains of L. shimeji, 3 strains had ability to form primordia on the rye grain medium without the host plant.

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