The Costa Rican form of this taxon has much blacker fibrils on the pileus. Otherwise, the growth on buried wood, subglobose spores, pear-shaped cheilocystidia, and sarcodimitic trama are in line with the temperate form. In some older field guides, M. platyphylla has been described as an edible fungus. However, in recent years, there have been reports that it is mildly poisonous.