Cortinarius fungi are distinguished by their rusty brown spores, often viscid caps and often obvious veil remains. Their gills are attached to the stem
Amanitaceae usually have white gills which are usually free, white spore prints and often features such as a bulbous base and a ring.
Agaricaceae have dark chocolate brown spores and free gills. They include some of the common edible mushrooms.
Crepidotaceae have cinanamon brown spores and attached gills. The species Crepidotus always grows on wood.
As the name suggests, Schizophyllaceae are known for their split gills. They have white spores.