Arne Thell

Flavocetraria is a genus of lichenized ascomycete fungi in the family Parmeliaceae. The genus contains two species found in arctic-alpine and boreal regions, Flavocetraria cucullata and F. nivalis (syn. Cetraria nivalis).

Cetrariella is a genus of foliose lichens in the family Parmeliaceae. It contains three species.

Parmelia ernstiae is a species of foliose lichen in the family Parmeliaceae. It is part of the Parmelia saxatilis species complex and can be distinguished from similar species by its strongly pruinose thallus, small rounded lobes, and unique secondary metabolite composition. First described in 2002 from Germany, P. ernstiae has since been found to be widely distributed across Europe, including Fennoscandia, Eastern Europe, and more recently, the Macaronesian region. The species typically grows on tree bark in various forest types, but has also been observed on rocks. Its identification often

Tuckneraria is a genus of lichen-forming fungi in the family Parmeliaceae.

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Melanelia hepatizon, commonly known as the rimmed camouflage lichen or the rimmed brown-shield, is a species of saxicolous (rock-dwelling), foliose lichen in the family Parmeliaceae. Its thallus, ranging in colour from brown to black, features narrow, elongated lobes that can be flat, convex, or concave. This lichen has a circumpolar distribution, occurring in Asia, Europe, North America, Iceland, and Greenland.

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Allocetraria madreporiformis, commonly known as V-fingers, is a species of fruticose lichen in the family Parmeliaceae. It forms a yellow-brown thallus of branching, somewhat inflated lobes that grow directly on the ground in arctic and high-mountain (alpine) habitats across the Northern Hemisphere. The species favours calcareous (lime-rich) soils in exposed, wind-swept sites such as ridges and arctic steppes, where wind erosion keeps mineral soil surfaces open. First described in 1810 by Erik Acharius and placed in Allocetraria in 1996, it contains usnic acid and protolichesterinic acid.

Xanthoparmelia knudsenii is a species of saxicolous (rock-dwelling), foliose lichen in the family Parmeliaceae. Found in the United States, it was formally described as a new species in 2009 by the lichenologists Arne Thell, John Alan Elix and Ulrik Søchting. The type specimen was collected from Mohave County, Arizona in May 2003. The species epithet honors American lichenologist Kerry Knudsen. The distribution of this species includes southwestern North America, extending south to central Mexico. It grows on acidic rocks in semi-open woodlands.

Marchantiana is a genus of lichen-forming fungi in the family Teloschistaceae. It contains seven species of corticolous (bark-dwelling), crustose lichens, recorded mainly from Australia. Originally proposed in 2014, the genus underwent significant revision in 2024 when molecular studies showed it comprised two distinct evolutionary lineages. This led to the creation of the new genus Taedigera to accommodate the cool-temperate species from New Zealand and Patagonia, while Marchantiana was retained for the warmer-climate Australian species. Later DNA-based work has treated Streimanniella as a

Gallowayella is a genus of lichen-forming fungi in the family Teloschistaceae. It has 15 species. The genus was circumscribed in 2012 by Sergey Kondratyuk, Natalya Fedorenko, Soili Stenroos, Ingvar Kärnefelt, Jack Elix, and Arne Thell, with Gallowayella coppinsii assigned as the type species. The generic name honours New Zealand lichenologist David John Galloway (1942–2014).

Caloplaca magnussoniana is a species of crustose lichen in the family Teloschistaceae. This small orange-brown lichen forms crusty patches on both volcanic rocks like dolerite and basalt, as well as limestone surfaces in sheltered but well-lit locations. It is found in temperate southeastern Australia, particularly in Victoria and Tasmania, from sea level up to about 600 metres elevation. The species is named after the Swedish lichenologist Adolf Hugo Magnusson and can be distinguished from similar species by its tightly clustered fruiting bodies and unique microscopic features including

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Seawardiella is a genus of lichen-forming fungi in the family Teloschistaceae. It contains two species of corticolous (bark-dwelling) crustose lichens.

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Huneckia is a genus of crustose lichens in the subfamily Caloplacoideae of the family Teloschistaceae. It has four species.

Cetrariella sorediella is a species foliose (leafy) lichen in the family Parmeliaceae.

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Brownliella is a genus of crustose lichens in the subfamily Teloschistoideae of the family Teloschistaceae. It has two species. The genus was established in 2013 and is named after the Australian botanist Sue Brownlie. These lichens are characterised by their flat, crusty growth and colours ranging from dull pink to vivid orange, caused by natural pigments.

Arctocetraria is a genus of fruticose lichens in the family Parmeliaceae. It has three species.

Yoshimuria is a genus of lichen-forming fungi in the family Teloschistaceae. It has four species of crustose lichens.

Upretia is a genus of lichen-forming fungi in the family Teloschistaceae. Species in this genus form rounded, crust-like growths on rock, typically olive-grey to brownish grey in colour, with lobed or scale-like margins. The genus is known from India and China, with one species also recorded from Mexico, and currently includes five described species. It occurs on exposed rock in habitats ranging from low-elevation bauxite outcrops and arid valley systems to high-elevation alpine deserts on the Tibetan Plateau. A 2023 molecular study confirmed the genus as a distinct lineage, with its closest

Tassiloa is a genus of lichen-forming fungi in the family Teloschistaceae. It has two species.

Streimanniella is a genus of lichen-forming fungi in the family Teloschistaceae. It includes six species of crustose lichens, recorded mainly from Australia, with S. asserigena also known from Europe. Species in this genus form a crust-like thallus ranging from white to dark brownish-grey, with blackish to orange-brown fruiting bodies. Its taxonomic placement has been debated, but molecular studies recover it as a distinct genus within the subfamily Caloplacoideae.