Hannes Hertel

Trapeliaceae is a family of lichens in the order Baeomycetales. The family contains 12 genera and about 125 species.

Trapeliopsis is a genus of lichen-forming fungi in the family Trapeliaceae. These lichens form thin, granular crusts or tiny overlapping scales (squamules) that create miniature rosette patterns on their growing surface. The genus was established in 1980 by Hannes Hertel and Gotthard Schneider and includes about 20 species found worldwide.

Dibaeis baeomyces, commonly known as pink earth lichen, is a fruticose lichen belonging to the family Icmadophilaceae.

Carbonea is a genus of fungi in the family Lecanoraceae. Most of the species grow on lichens. The genus is widespread, and contains 20 species. Carbonea was originally circumscribed as a subgenus of Lecidea in 1967 before it was promoted to generic status in 1983.

Miriquidica is a genus of lichen in the family Lecanoraceae. The genus was circumscribed in 1987 by the lichenologists Hannes Hertel and Gerhard Rambold, with Miriquidica complanata assigned as the type species. According to Dictionary of the Fungi (10th edition, 2008), the widespread genus contains 23 species, found predominantly in arctic-alpine regions.

Adelolecia is a genus of crustose lichens in the family Lecanoraceae. These rock-dwelling lichens form thin crusts made up of small angular patches, typically reaching about 12 cm across with distinctive black, round fruiting bodies that sit directly on the surface. The genus includes four species found in mountainous and arctic regions, where they grow on various types of rock and are distinguished by chemical compounds (lichen products) that produce colourful diagnostic reactions when tested with laboratory solutions.

Porpidia crustulata is a species of crustose lichen in the genus Porpidia, commonly known as the concentric boulder lichen.

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Carbonea vitellaria is a species of lichenicolous fungus belonging to the family Lecanoraceae. It has a worldwide distribution. In Iceland it has been reported growing on Candelariella vitellina near Egilsstaðir and on King George Island, Antarctica.

Carbonea supersparsa is a species of lichenicolous fungus belonging to the family Lecanoraceae. It is widespread in the Northern Hemisphere. In Iceland it has been reported growing on Lecanora cenisia near Egilsstaðir and Lecanora polytropa near Seyðisfjörður.

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Rimularia exigua is a species of lichen in the family Trapeliaceae. The type collection was found growing on boulders in a eucalypt forest in New South Wales.

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Placopsis lambii is a species of saxicolous (rock-dwelling), crustose lichen in the family Trapeliaceae. It was formally described as a new species in 1987 by lichenologists Hannes Hertel and Volkmar Wirth. The species epithet lambii honours polar explorer and lichenologist Elke Mackenzie (formerly Lamb). In North America, one vernacular name for the lichen is pink bull's-eye lichen. Placopsis lambii is distinguished by its placodioid thallus that features deeply notched and radiating edge lobes, a glossy upper surface, typically dark and somewhat rounded soralia, and non-lobate cephalodia

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Miriquidica deusta is a species of lichen in the family Lecanoraceae. A North American native, it generally grows on siliceous rocks. It belongs to the subdivision Pezizomycotina of the division Ascomycota, within the order Lecanorales. These are found in both general and Estonian herbariums.

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Grimmicola is a genus of fungi in the family Helotiaceae. This is a monotypic genus, containing the single species Grimmicola parasiticus.

Farnoldia is a small genus of lichen-forming fungi in the family Lecideaceae. These lichens grow as dark crusts on limestone and other calcium-rich rocks, especially in mountainous areas. The genus contains three known species and can be distinguished from similar lichens by their distinctive black fruiting bodies (apothecia) and violet reaction when tested with iodine staining.

Xenolecia is a genus of saxicolous (rock-dwelling) and crustose lichens in the family Lecideaceae. It has two species: X. cataractarum, and the type species, X. spadicomma. The genus was circumscribed by German lichenologist Hannes Hertel in 1987 to contain the type, a lichen known at that time only from the type locality on Wellington Island, Chile. Its range has since been expanded to include the Falkland Islands and northern Patagonia. X. cataractarum, found in Campbell Island, New Zealand was added to the genus in 2017.

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Stephanocyclos is a genus of lichen-forming fungi in the family Lecideaceae. It is a monotypic genus, containing the single species Stephanocyclos henssenianus. This crustose lichen was formally described as a new species in 1983 by German lichenologist Hannes Hertel as part of a set of exsiccata (dried herbarium specimens). The type specimen was collected from volcanic rock found on Marion Island, one of the two Prince Edward Islands in the southern Indian Ocean. The specific epithet henssenianus honours lichenologist Aino Henssen.

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Porpidia nadvornikiana is a rare species of saxicolous (rock-dwelling), crustose lichen in the family Lecideaceae. It is known to occur only in two localities, in the Czech Republic and in Spain, where it grows on serpentinite, an ultramafic rock.

Porpidia macrocarpa is a species of saxicolous (rock-dwelling), crustose lichen in the family Lecideaceae.