tricholoma murrillianum is a gilled mushroom found west of the rocky mountains in north america growing in coniferous woodland. this ectomycorrhizal fungus is an edible species that exists in a symbiotic relationship with various species of conifer as well as tan oak and madrone. it belongs to the genus "tricholoma" in the matsutake species complex, which includes the closely related east asian songi or matsutake as well as the american matsutake ("t. magnivelare") and mexican matsutake ("t. mesoamericanum"). "t. murrillianum" is also known as the ponderosa mushroom, pine mushroom, and western matsutake.