Ulf Arup

Polycauliona polycarpa is a species of corticolous (bark-dwelling), foliose lichen in the family Teloschistaceae. It was first formally described by German botanist Georg Franz Hoffmann in 1796, as Lobaria polycarpa. It has acquired quite an extensive synonymy in its taxonomic history. In 2013, Patrik Frödén and colleagues transferred it to the genus Polycauliona, as part of a molecular phylogenetics-based restructuring of the family Teloschistaceae. In northern North America, one vernacular name for the species is pin-cushion sunburst lichen.

Candelaria pacifica is a widely distributed corticolous (bark-dwelling), leprose lichen. It was formally described as a species in 2011. It is a very small, yellow, bark-dwelling lichen that is often confused with the similar Candelaria concolor but differs in having eight-spored asci, lacking a lower cortex, and producing fewer rhizines. The species is widespread in western North America and has become increasingly recognized across Europe, where herbarium revisions have shown that many specimens previously identified as C. concolor belong to this species. It grows mainly on nutrient-rich

Variospora flavescens is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. It is a common, widely distributed species and has been recorded in Africa, Asia, Europe, and Macaronesia. It forms large, circular, orange patches up to 10 cm or more across on calcareous stone such as limestone and mortar. First described in 1762, the species has been placed in several genera and was transferred to Variospora in 2013.

Protoparmeliopsis garovaglii is a species of saxicolous (rock-dwelling), crustose lichen in the family Lecanoraceae. The species was originally described as Placodium garovaglii by German lichenologist Gustav Wilhelm Körber in 1859. It was later classified in Lecanora in 1900, and known as a member of that genus for more than a century. Molecular phylogenetics showed that Lecanora was highly polyphyletic, and as a result, the genus was divided into several smaller, more phylogenetically natural genera. Subsequently, in 2015, Lecanora garovaglii was transferred to genus Protoparmeliopsis.

Flavoplaca is a genus of crust-like or scaly lichens in the family Teloschistaceae. It has about 30 species with a mostly Northern Hemisphere distribution. The genus was established in 2013 when genetic studies revealed that these species formed their own distinct evolutionary group, separate from other lichen classifications where they were previously placed. These lichens typically grow on limestone and other calcium-rich rocks, forming distinctive orange to yellow crusty patches that are particularly common in coastal environments and sunny locations. Most species grow directly on rock

Bryoplaca is a small genus of lichen-forming fungi belonging to the family Teloschistaceae. Established in 2013 by Ulrik Søchting, Patrik Frödén and Ulf Arup, this small genus comprises just three species that specialise in growing on moss-covered substrates in cold regions of the Northern Hemisphere. These lichens are distinguished by their bright orange fruiting discs that stand out like tiny sunbursts against the mossy cushions they inhabit, earning the genus its name which literally means 'moss-plate'.

Athallia holocarpa is a species of lichenised fungus in the Teloschistaceae family. It was first described as Verrucaria oblitterata var. holocarpa by Georg Franz Hoffman in 1796, and transferred to the new genus, Athallia, in 2013 by Ulf Arup, Ulrik Søchting, and Patrik Frödén.

Athallia is a genus of lichen-forming fungi in the family Teloschistaceae. Most species have a poorly developed or almost invisible thallus, with the fruiting bodies often appearing to sit directly on the substrate. The genus occurs on bark, wood, and rock, and is found mainly in temperate regions of the Northern Hemisphere. All species share a characteristic set of orange anthraquinone pigments known as chemosyndrome A.

Variospora aurantia is a species of lichen belonging to the family Teloschistaceae. In Sicily, it has been reported as a host for the lichenicolous fungus species Muellerella lichenicola.

Variospora is a genus of crustose lichens belonging to the family Teloschistaceae. The genus was established in 2013 when DNA studies revealed that many species previously grouped under the traditional large genus Caloplaca actually belonged to distinct evolutionary lineages. These bright orange lichens are distinguished by their variable ascospore shapes—which can be lemon-shaped, hourglass-shaped, or simply divided by a straight partition—and their distinctive purple reaction when tested with potassium hydroxide solution.

Squamulea subsoluta is a species of saxicolous (rock-dwelling), squamulose lichen in the family Teloschistaceae. It was first formally described by Finnish lichenologist William Nylander in 1873, who named it as a variety of Lecanora murorum. He promoted it to species status three years later, as Lecanora subsoluta. Ulf Arup and colleagues transferred the taxon to the genus Squamulea in 2013, following a molecular phylogenetics-based restructuring of the family Teloschistaceae.

Rufoplaca is a genus of lichen-forming fungi in the family Teloschistaceae. The genus is found primarily across the Northern Hemisphere, with most species occurring in Europe and additional records from North America and Asia. These lichens typically grow as thin crusts with orange-red colouration on sun-exposed rocks and other surfaces. The genus was established in 2013 to group together several previously scattered species that genetic studies showed formed a natural evolutionary lineage.

Calogaya is a genus of lichen-forming fungi belonging to the family Teloschistaceae. It has 19 species. The genus was circumscribed in 2013 by Ulf Arup, Ulrik Søchting, and Patrik Frödén. The generic name Calogaya ("spectacular Gaya") honours Dr. Ester Gaya (fl. 2001), a Spanish botanist from the University of Barcelona.

Xanthocarpia crenulatella is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae.

Variospora thallincola is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae.

Squamulea is a genus of lichen-forming fungi in the family Teloschistaceae. It has 15 species. The genus was circumscribed in 2013 by Ulf Arup, Ulrik Søchting, and Patrik Frödén, with Squamulea subsoluta assigned as the type species. Five species were included in the original account of the genus. The genus name alludes to the squamulose growth form of most of its species. Squamulea has a worldwide distribution; when the genus was originally created, the centre of distribution was thought to be in southwestern North America.

Sirenophila is a genus of rock-dwelling crustose lichens in the subfamily Teloschistoideae of the family Teloschistaceae. It comprises six species with an Australasian distribution. These lichens form crusty growths on rocks in coastal areas, with some species having distinct lobes at the edges while others have irregular margins. The genus is endemic to the Australasian region, where species colonise seashore rocks exposed to maritime conditions. Like many members of the Teloschistaceae, some Sirenophila species contain orange anthraquinone pigments.

Parvoplaca is a genus of lichen-forming fungi in the family Teloschistaceae. The genus was circumscribed in 2013 by Ulrik Søchting, Patrik Frödén, and Ulf Arup.

Pachypeltis is a genus of lichen-forming fungi in the family Teloschistaceae. It comprises six species.

Gyalolechia flavovirescens is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae.

Flavoplaca oasis is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. It is widely distributed across Europe, and has been reported in Western Asia, China, and North Africa.

Flavoplaca maritima is a species of crustose lichen in the family Teloschistaceae. It is found in costal areas of Northern, Western, and Southern Europe. It mostly occurs on rocks, but has also been recorded growing on wood.

Flavoplaca limonia is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. It was first formally described as a new species in 1994 by lichenologists Pier Luigi Nimis and Josef Poelt. Ulf Arup and colleagues transferred the taxon to the genus Flavoplaca in 2013, following a molecular phylogenetics-based restructuring of the family Teloschistaceae. Initially thought to be a southern European species, it has since been shown to have a broader distribution, having been reported from Morocco, Denmark, and Sweden. It can be differentiated from the similar-looking

Flavoplaca flavocitrina is a species of crustose lichen in the family Teloschistaceae. Found in Europe, it was originally described as a new species in 1886 by the Finnish lichenologist William Nylander, who classified it as a member of the genus Lecanora. After having spent time in various different genera throughout its taxonomic history, it was reclassified in the genus Flavoplaca in 2013 following a molecular phylogenetics-informed reorganization of the Teloschistaceae. On the Commander Islands (Russian Far East), Flavoplaca flavocitrina has been recorded from four coastal sites on

Flavoplaca arcis is a species of saxicolous (rock-dwelling), crustose to squamulose (scaley) lichen in the family Teloschistaceae. Although widely distributed in Northern, Central, and Western Europe, it is not commonly encountered.

Cerothallia is a genus of crustose lichens in the family Teloschistaceae. It has four species, all of which occur in the Southern Hemisphere. The genus was circumscribed in 2013 by Ulf Arup, Patrik Frödén, and Ulrik Søchting, with Cerothallia luteoalba assigned as the type species. The type is more widely distributed, as it is also found in Europe and North America. The generic name Cerothallia means "with waxy thallus".

Calogaya pusilla is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. Calogaya pusilla is common in Europe, and has been recorded from a few locations in the United States. Its typical habitat is on vertical, calcareous rock surfaces. It also occurs on walls with mortar.

Calogaya decipiens is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. It was first scientifically described in 1867 by German lichenologist Ferdinand Christian Gustav Arnold, as a member of the genus Physcia. Ulf Arup and colleagues transferred the taxon to the genus Flavoplaca in 2013, following a molecular phylogenetics-based restructuring of the family Teloschistaceae.

Athallia pyracea is a species of crustose lichen in the family Teloschistaceae. It forms a very thin, often inconspicuous greyish crust on bark, with scattered to crowded orange fruiting bodies typically 0.3–1.0 mm across. The species grows mainly on the nutrient-enriched bark of deciduous trees such as aspen, poplar, and ash, and is considered a nitrophilous (nitrogen-loving) lichen. It is widespread in temperate regions of the Northern Hemisphere, occurring across Europe, North America, and parts of Asia. The yellow and orange parts of the thallus and apothecia turn purple when treated with

Athallia cerinelloides is a species of lichen-forming fungus in the family Teloschistaceae. It grows on bark and produces tiny yellow to orange apothecia (disc-like fruiting bodies), while the thallus is often so reduced that it can be hard to see. The species was long treated in the genus Caloplaca as Caloplaca cerinelloides.