Spore print "light-colored": white or buff, sometimes tinged with pink or tan. Greenish and (except for the Russulales) yellow spore prints also go here
Stalk fibrous, not fracturing like a piece of chalk
Mature fruiting body with an omphalos, never bell-shaped or conical. Never even flat except when very young.
Usually more colorful than the other choices
Often growing in or among a lichen