Jan Vondrák

Caloplaca saxicola is a small bright orange crustose lichen that grows on rock all over the world. It is commonly called rock firedot lichen, jewel lichen or rock jewel lichen. It has short, inflated looking elongate 1–2 mm and .3-.1 mm wide lobes that have an abrupt margin at the edge, and no prothallus. It lacks isidia or soredia. Apothecia may be immersed in the thallus or adnate to it, with rims of thallus-like tissue (lecanorine) with orange, flat, .4–1 mm wide epruinose discs. Aptohecia develop near the lobe tips. C. ignea and C. impolita are similar but bigger, and have apothecia that

Lecania leprosa is a species of saxicolous (rock-dwelling), crustose lichen in the family Ramalinaceae. It occurs in Eastern Europe.

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Caloplaca sterilis is a corticolous (bark-dwelling), crustose lichen belonging to the family Teloschistaceae, described in 2011. It is primarily found in steppe and sand dune habitats in the Black Sea region, and has been recorded from Bulgaria, Romania, southwest Russia, and Ukraine. Caloplaca sterilis is characterised by tiny squamules/areoles with contrasting pale greyish-green to greenish soredia. It is easily overlooked and challenging to identify when completely sorediate and sterile (i.e., without any apothecia), especially as its soredia do not contain the typical Sedifolia-grey

Sanguineodiscus is a genus of lichen-forming fungi in the family Teloschistaceae. It is characterized by its deep red apothecial discs, found predominantly in the Mediterranean basin, Central Asia, Northern Africa, and Europe. This genus comprises both saxicolous (growing on rocks) and corticolous (growing on tree bark) species, which are found in various habitats, such as inland rain-sheltered base-rich siliceous rocks, seashore siliceous rocks, and calcareous outcrops in Central Asia. Sanguineodiscus, established in 2023, contains four recognized species, but it is believed that the genus

Lichenostigma svandae is a species of lichenicolous (lichen-dwelling) fungus in the family Phaeococcomycetaceae. This microscopic parasitic fungus appears as soot-grey flecks on its host lichen species Acarospora cervina, forming dark, net-like strands of fungal threads that anchor themselves to the lichen surface with short root-like offshoots. Described as new to science in 2007 from specimens collected in Crimea, it is known from sun-exposed limestone outcrops in Europe and southwestern Asia.

Kuettlingeria albolutescens is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. It occurs in Europe and Western Asia.

Caloplaca sipmanii is a species of corticolous (bark-dwelling), crustose lichen in the family Teloschistaceae. Found in Queensland, Australia, it was formally described as a new species in 2009 by the lichenologists Sergey Kondratyuk, Ingvar Kärnefelt, John Elix, and Jan Vondrák. The type specimen was collected by the third author from Baga National Park (Rockhampton, Queensland) at an elevation of 50 to 150 m (160 to 490 ft), where it was found growing on Eucalyptus bark. The species epithet of this lichen pays homage to the Dutch lichenologist Harrie Sipman, in whose honour the volume

Opegrapha vulpina is a species of lichenicolous (lichen-eating) fungus in the family Opegraphaceae. It is found in the Czech Republic, Dobruja, Romania, and the Italian Apennine Mountains. It grows parasitically on two species of saxicolous (rock-dwelling), crustose lichens.

Lendemeriella aureopruinosa is a species of crustose lichen in the family Teloschistaceae. Found in the Russian Far East, it was formally described as a new species in 2021 by Ivan Frolov, Jan Vondrák, Ulf Arup, Liudmila Konoreva, and Sergey Chesnokov, Lidia Yakovchenko, and Evgeny Davydov. The type specimen was collected on the banks of River Bes-Yuryakh (Yllymakh, Republic of Sakha); here it was found growing on siliceous outcrops in a forest comprising largely birch, alder, and larch trees. The thallus of the lichen ranges in form from an inconspicuous grey film to a more well-developed

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

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Caloplaca clavatoisidiata is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. Found in Australia, it was formally described as a new species in 2009 by the lichenologists Sergey Kondratyuk, Ingvar Kärnefelt, and Jan Vondrák. The type specimen was collected by the third author from Porcupine Gorge National Park (Hughenden, Queensland) at an altitude between 550 and 600 m (1,800 and 1,970 ft); there, it was found growing on sandstone. It is only known to occur at the type locality. The species epithet refers to the clavate (club-shaped) isidia.

Pyrenodesmia tianshanensis is a species of saxicolous (rock-dwelling) crustose lichen in the family Teloschistaceae. It forms a yellowish-brown crust broken into many small, raised patches, each typically bearing a single dark brown to black fruiting body. The species was originally described in 2011 under the name Caloplaca tianshanensis and was transferred to Pyrenodesmia in 2020. It is known only from limestone in the Tian Shan Mountains of Xinjiang in northwestern China.

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Parvoplaca nigroblastidiata is a species of corticolous (bark-dwelling), crustose lichen in the family Teloschistaceae. Found in Europe and Alaska, it was formally described as a new species in 2015 by Ulf Arup, Jan Vondrák, and Mehmet Halıcı. The type specimen was collected in the Nyhem Parish, Jämtland (Sweden), where it was growing on the bark of Populus tremula. In Turkey, it has been recorded at high altitudes on the bark of Juniperus excelsa and Abies cilicica, while in a single record from Alaska it is growing on Populus. In 2018 it was reported from the sacred groves of Epirus in

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Lecanora substerilis is a species of corticolous (bark-dwelling), crustose lichen in the family Lecanoraceae. It is found in Eastern Europe, in old-growth beech forests of the Carpathian Mountains in the Czech Republic, Slovakia, Romania and Ukraine.

Caloplaca fluviatilis is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. It is found in the Republic of Tyva in Siberia.

Calogaya orientalis is a species of corticolous (bark-dwelling) and muscicolous lichen (moss-dwelling), crustose lichen in the family Teloschistaceae. It is found in arid steppe and desert habitats in Northwestern China, Iran, and Turkey. The thallus of this lichen is reduced, similar to species in the genus Athallia.

Calogaya haloxyli is a species of epiphytic, squamulose lichen in the family Teloschistaceae. Found in Northeast China and Iran, it was formally described as a new species in 2018 by Mahroo Moniri, Hurnisa Shahidin, and Jan Vondrák. The type specimen was collected from the Dzungaria basin desert at an altitude of 439 m (1,440 ft), where it was found growing on the stems of old Haloxylon persicum plants. The species epithet refers to the genus of its host. At the time of its publication, the lichen had been recorded from the Dzungaria basin and Tian Shan Mountains in China, and once in

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