An undescribed species ofInocybe,I. immigranssp. nov., has been encountered several times on mine wastes in north-eastern and east-central Ontario. It is characterized by large smooth basidiospores, a dark entirely cystidiate bulbous stipe, and a brown scaly pileus. It is thought to be ectomycorrhizal and has been collected in association withBetula papyrifera, Populus balsamifera, andSalixspp.