The deadly toxin orellanine has been found in at least 34 Cortinariaceae.
Galerina are mushrooms with ornamented spores, where the ornamentation comes from a spore covering the breaks up on maturity. These mushrooms are small, and Mycena like, and are saprotrophic on mosses, grass and wood.
Hebeloma are mushrooms with dull brown colors, lightly warted (almost smooth) spores that are brown in deposit (not rusty-brown). These mushrooms will be terrestrial and mycorrhizal, and can range from small to large and fleshy just like Cortinarius, but are separated by always having cap with a gelatinous surface, the presense of cheilocystidia, and the absence of pleurocystidia.
Inocybe are mushrooms with a dry silky, radially fibrous cap surface, and spores with are nodulose or ellipsoid smooth and brown in deposit. These mushrooms will be terrestrial and mycorrhizal, and most tend to be small, with only a few that are large and fleshy.
Naucoria are mushrooms with warted spores, where the spores are lemon-shaped with pointed warts. These mushrooms tend to be small and non-descript little brown jobs.
Phaeocollybia are mushrooms that are umbonate with long rooting stipes, and spores that are brown in deposit. These are associated with the roots of trees (different trees for different species).