Omphalina is a genus of small agarics with white, nonamyloid, basidiospores and decurrent gills.

Omphalina is the diminutive of Omphalia which is a reference to the belly button or navel-like appearance of the small dome-shaped caps with a central depression.

The generic name Omphalina is an ancient one, linked to the even older mushroom name Omphalia which cannot be used because it is an illegitimate later homonym.

Molecular phylogenetic studies using DNA show this species and others on mosses with reddish brown to yellowish brown pigments that encrust the hyphal walls are related, while many other former Omphalinas are distantly related and are classified in other orders, or families, and in other genera.

Excluded species whose exclusion is supported by molecular analysis, include the genera: Blasiphalia, Chrysomphalina, Chromosera, Contumyces, Gerronema, Haasiella, Loreleia, Rickenella, etc.