Catapyrenium boccanum is a species of squamulose (scaley), rock-dwelling lichen in the family Verrucariaceae.

[3] Because of its combination of squamulose thallus, simple ascospores (without any septa), and lack of algae in the hymenium, this species is a "catapyrenioid" lichen, of which more than 80 exist in the Verrucariaceae.

[4] The lichen was first formally described as a new species in 1955 by Czech lichenologist Miroslav Servít.

[5] Othmar Breuss transferred it to Catapyrenium in 1990 as part of a revision of that genus.

[6] In Europe, the lichen has a largely Mediterranean distribution, although scattered records are known from western and southern Europe.