Othmar Breuss

Placopyrenium is a genus of saxicolous (rock-dwelling), crustose lichens in the family Verrucariaceae.

Involucropyrenium is a genus of lichens in the family Verrucariaceae. It has 10 species. Species in this genus are characterised by their minute, scale-like growth form and distinctive reproductive structures capped with dark sheaths. Most of the ten recognised species were described relatively recently, with several new species added as recently as 2021.

Placocarpus schaereri is a species of saxicolous (rock-dwelling), areolate, and crustose lichen in the family Verrucariaceae. Found in Europe and West Asia, it is the type species of genus Placocarpus. Juvenile forms of Placocarpus schaereri are often parasitic on the lichen Protoparmeliopsis muralis.

Anthracocarpon is a small fungal genus in the family Verrucariaceae. It is found in Mediterranean regions, the Caribbean, and South America. These lichens form low, crusty patches made up of overlapping scales that grow close to the ground on limestone and other rocky surfaces. The genus is recognized by its distinctive coal-black fruiting bodies, which give it its name—derived from Greek words meaning "coal" and "fruit". Established in 1996, the genus currently includes three species.

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Heteroplacidium acarosporoides (Mojave stipplescale) is a glossy reddish to dark brown or black squamulose lichen dotted with black perithecia that grows on rock.

Heteroplacidium is a genus of lichen-forming fungi in the family Verrucariaceae. The genus was circumscribed by Austrian lichenologist Othmar Breuss in 1996 with Heteroplacidium imbricatum assigned as the type species. It was proposed as a segregate of Catapyrenium. Other morphologically similar genera are Neocatapyrenium, Placidium, and Scleropyrenium, although molecular phylogenetic analyses indicate that they are independent monophyletic lineages within the Verrucariaceae. Most Heteroplacidium species are autonomous lichens, generally crustose and areolate. Four species in the genus are

Catapyrenium boccanum is a species of squamulose (scaley), rock-dwelling lichen in the family Verrucariaceae. It grows on mortar or on calcareous rock. Its squamules are up to 4 mm wide, pale to dark brown with black margins and a black underside. Ascospores measure 11–15 by 5–8 μm. 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.

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