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The primary stage in shiro formation of tricholoma matsutake

, : The primary stage in shiro formation of tricholoma matsutake. Nippon Kingakukai Kaiho 21(4): 505-512

The primary growth stage of a shiro (fungal colony) of T. matsutake was investigated for young shiros formed in Pinus denisflora forest. Shiro formation was frequently found on small terraced areas where young pine roots were distributed densely underground. At first, the shiro was formed as a small and shallow colony in the mineral soil horizon 1 or 2 yr after the mycorrhiza formation. Fruit bodies developed sporadically in the 3rd yr when the quantity of mycelium reached a level capable of producing them. Fairy ring formation was observed in the 5th yr after the onset of shiro formation. These estimates were based on the profile of a young shiro and the analysis of age rings of roots growing around its center. After the primary stage, the annual growth width of mycelium in soil appeared to be constant, irrespective of age and the microbial flora inside the shiro was extremely scanty due to its ability to exclude soil bacteria and fungi, especially from the active mycorrhizal zone.

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