Phacopsis is a genus of lichenicolous (lichen-dwelling) fungi. They are parasites of members of the large lichen family Parmeliaceae, of which they are also a member. Originally proposed by Edmond Tulasne in 1852 to contain 3 species, Phacopsis now contains 10 species, although historically, 33 taxa have been described in the genus. Many of the species are poorly known, some of them having been documented only from the type specimen.
Lichenopeltella cetrariae is a species of fungus belonging to the class Dothideomycetes. It has been found growing on Cetraria aculeata in Hrútey near Blönduós, Iceland and on Cetraria laevigata in Bulgan district, Mongolia and Toyama prefecture, Japan. In Japan, it has also been reported growing on Flavocetraria cucullata in Yamanashi prefecture and Nagano prefecture.
Xenonectriella nephromatis is a species of lichenicolous fungus in the family Nectriaceae. Found in Alaska, it was described as a species new to science in 2020 by Sergio Pérez-Ortega. The type specimen was discovered in the Hoonah–Angoon Census Area in Glacier Bay National Park, where it was growing on a Nephroma lichen. The specific epithet alludes to this host lichen.
Sclerococcum fissurinae is a species of lichenicolous fungus in the family Dactylosporaceae. Found in Alaska, it was formally described as a new species in 2020 by Sergio Pérez-Ortega. The type specimen was collected in the Hoonah-Angoon Census Area, just outside of Glacier Bay National Park. Here it was found growing on the script lichen species Fissurina insidiosa, which itself was growing on the bark of an alder tree. The specific epithet refers to its host.
Candelariella aggregata is a species of lichen in the family Candelariaceae. It is found in western North America, Mongolia, and Switzerland where it grows on mosses and plant debris.
Nanostictis caucasica is a species of lichenicolous (lichen-eating) fungus in the family Stictidaceae. It is known to occur only in a single locality in the North Caucasus region of Southern Russia, where it grows parasitically on the foliose lichen Parmelia sulcata.
Zwackhiomyces polischukii is a species of lichenicolous (lichen-eating) fungus in the family Xanthopyreniaceae. It occurs in Ukraine, where it parasitises the crustose lichens Bacidia fraxinea and B. rubella.
Buelliella lecanorae is a species of lichenicolous (lichen-eating) fungus in the class Dothideomycetes. It is found in a few locations in Estonia and in Crimea, where it grows parasitically on members of the Lecanora subfusca species group.
Neoechinodiscus kozhevnikovii is a species of lichenicolous (lichen-eating) fungus in the order Helotiales. It is known to occur in Russia, Austria, and Switzerland, where it grows parasitically on lichens in genus Cetraria.
Endococcus hafellneri is a species of lichenicolous (lichen-eating) fungus in the family Verrucariaceae. It is found in North Asia and the Russian Far East, Estonia, and Japan, where it grows on the lobes of the lichens Flavocetraria cucullata and Cetraria islandica.
Opegrapha verseghyklarae is a little-known species of lichenicolous (lichen-eating) fungus in the family Teloschistaceae. It is found in the Russian Far East, where it grows on the thalli and apothecia of the crustose lichen Ochrolechia pallescens.
Lichenopeltella stereocaulorum is a species of lichenicolous fungus belonging to the class Dothideomycetes. It was described in 2010 from an infected specimen of Stereocaulon botryosum.
Cercidospora stereocaulorum is a species of lichenicolous fungus in the genus Cercidospora but it has not been assigned to a family. It is known to parasitise lichens of the genus Stereocaulon.
Polycoccum laursenii is a species of lichenicolous fungus in the family Polycoccaceae. It was first described as a new species in 2004 by Russian mycologist Mikhail Petrovich Zhurbenko. It is found in Alaska and in Russia.
Phacopsis oroarcticae is a species of lichenicolous (lichen-dwelling) fungus in the family Parmeliaceae. It was formally described as a new species in 2010 by Russian mycologist Mikhail P. Zhurbenko. The type specimen was collected from a stony polar desert in the Severnaya Zemlya Archipelago in Central Siberia, where it was found growing on the lobes of the foliose lichen Brodoa oroarctica; the species epithet refers to its host. Infection by the fungus results in bleached, swollen, and sometimes contorted lobes. It is the first Phacopsis species known to have Brodoa as a host.
Phacopsis vulpicidae is a species of lichenicolous (lichen-dwelling) fungus in the family Parmeliaceae. It was formally described as a new species in 2019 by mycologists Mikhail P. Zhurbenko and Paul Diederich. The type specimen was collected by the first author near the headwaters of Ar Khordolyn gol River in Renchinlkhümbe Somon, at an altitude of 2,050 m (6,730 ft). There, in the upper limit of a Larix sibirica forest, the fungus was found growing on the thallus of a ground-dwelling Vulpicida juniperina lichen. The species epithet vulpicidae refers to the genus of its host. Infections by the fungus cause blister-like (bullate) swellings of the host thallus. It is known to occur in arctic and mountain tundra and taiga biomes of Asia, Europe, and North America (Alaska). Its only recorded host is Vulpicida juniperina, and almost all recorded host specimens have been terricolous.
Skyttea ochrolechiae is a species of lichenicolous (lichen-dwelling) fungus in the family Cordieritidaceae. Found in Japan, it was formally described as a new species in 2015 by Russian mycologist Mikhail P. Zhurbenko. The fungus grows on the epiphytic lichen Ochrolechia trochophora, but does not visibly damage its host. It is somewhat similar to Skyttea fusispora, but unlike that fungus, it has an orange-brown exciple that stains purple with the K test, and has shorter ascospores, typically measuring 14.7‒18.9 by 3.1‒3.9 μm.
Cetraria laevigata is a species of ground-dwelling, fruticose (bushy) lichen in the family Parmeliaceae. It was formally described as a new species by Russian lichenologist Kseniya Aleksandrovna Rassadina in 1943. In North America, it is commonly known as the striped Iceland lichen.
Solorina crocea, commonly known as the orange chocolate chip lichen, is a species of terricolous (ground-dwelling) and foliose (leafy) lichen in the family Peltigeraceae. The lichen, which was first formally described by Carl Linnaeus in 1753, has an arctic–alpine and circumpolar distribution and occurs in Asia, Europe, North America, and New Zealand. It generally grows on the bare ground in sandy soils, often in moist soil near snow patches or seepage areas. Although several forms and varieties of the lichen have been proposed in its history, these are not considered to have any independent taxonomic significance.
Capronia cogtii is a rare species of lichenicolous (lichen-dwelling) fungus in the family Herpotrichiellaceae. Found in northern Mongolia, it was described as a new species in 2019.
