Lactarius fumosibrunneus in a relict Fagus grandifolia var. mexicana population in a Mexican montane cloud forest

Lactarius fumosibrunneus, a species considered in the literature contaxic with L. fumosus, is interpreted here as an independent taxon due to the differences in the structure of pileipellis and presence of cystidia. Recognition of L. fumosibrunneus is supported by morphological comparison with original collections, Mexican samples, and type specimens of related taxa. Collections of L. fumosibrunneus were found in the Mexican montane cloud forest of Central Veracruz (east coast of Mexico) where it appears to be ectomycorrhizal partner of the tree Fagus grandifolia var. mexicana.