Rhizocarpon is a genus of crustose, saxicolous, lecideoid lichens in the family Rhizocarpaceae. The genus is common in arctic-alpine environments, but also occurs throughout temperate, subtropical, and even tropical regions. They are commonly known as map lichens because of the prothallus forming border-like bands between colonies in some species, like the common map lichen.
Rhizocarpon diploschistinum is an uncommon species of lichenicolous (lichen-dwelling), crustose lichen in the family Rhizocarpaceae. It parasitises the lichen Diploschistes muscorum. It is distinguished from similar species by its distinctive yellow thallus and presence of rhizocarpic acid. This lichen has been found in shrub steppe and grasslands in central Washington and north-central Oregon, USA.
Chrysothrix tchupalensis is a little-known species of saxicolous (rock-dwelling), powdery lichen in the family Chrysotrichaceae. It occurs in north Queensland, Australia. The lichen forms a powdery, bright yellow thallus that grows on sheltered, humid rocks in a tropical rainforest environment.
Caloplaca conranii is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. The lichen has a bright yellow thallus about 1–2 cm wide, featuring a thick texture with convex, pustule-like formations around the edges and occasionally forming clusters in the centre. Its apothecia are quite large and heavy, ranging from 0.4 to 1.5 mm in diameter, with a flat, dull orange or brownish-orange disc, and long, narrow ascospores.
Sirenophila maccarthyi is a species of corticolous/lignicolous, crustose lichen in the family Teloschistaceae. It has a thallus that is whitish or greyish, often inconspicuous and not always continuous, which can appear darker or dirty grey near its numerous, clustered apothecia. Sirenophila maccarthyi is distributed across regions including Western Australia, New South Wales, Victoria, Tasmania, and New Zealand, in both coastal and inland habitats. It typically grows on the bark and dead wood of a wide range of trees and shrubs such as Acacia sophorae, Araucaria excelsa, and various Eucalyptus species.
Tetramelas gariwerdensis is a species of saxicolous (rock-dwelling), crustose lichen in the family Physciaceae, described in 2020. It is found in the Grampian Mountains in western Victoria, Australia.
Buellia arida is a species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae. It occurs in Australia. Buellia arida grows up to 4 cm wide, either concealed within or visible on rock surfaces, forming small, fragmented patches. It features an off-white, dull thallus, numerous black apothecia that become convex over time, and spores that evolve from pale to dark brown, characterized by their ellipsoid shape and finely decorated surface.
Buellia cravenii is a species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae. It is found in Australia. The lichen spreads up to 3.5 cm wide thick, forming a continuous, grey-white cracked pattern of areoles.
Amandinea pilbarensis is a little-known species of crustose lichen in the family Physciaceae, First described in 2020, it is found in Australia. It is similar to Amandinea polyxanthonica, but can be distinguished by its smaller ascospores and the presence of calcium oxalate and thiophanic acid in the medulla.
Caloplaca kiewkaensis is a species of bark- and wood-dwelling crustose lichen in the family Teloschistaceae. Described as a new species in 2011, this lichen is found in the Far East region of Russia, specifically within Primorsky Krai.
Rhizocarpon timdalii is a species of saxicolous (rock-dwelling), crustose lichen in the family Rhizocarpaceae. Identified and described as a new species in 2002, this lichen is characterized by its brown thallus composed of convex areoles. It occurs in Europe and North America.
Buellia subalbula is a species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae. It occurs in coastal southern Africa, South America, and Australia, where it grows on calcareous rocks.
Rhizocarpon torquatum is a species of saxicolous (rock-dwelling), crustose lichen in the family Rhizocarpaceae. This species is recognised by its pale, thick, smooth, areolate thallus that contains hypostictic acid as a major metabolite, and its large apothecia that are distinctively adorned with a whitish inner collar in immature stages.
Rhizocarpon exiguum is a species of saxicolous (rock-dwelling), crustose lichen in the family Rhizocarpaceae. This Tasmanian species is characterised by its minimalistic appearance with very small apothecia and a thallus that is pale, sparse and areolate.
Rhizocarpon grande is a species of saxicolous (rock-dwelling), crustose lichen in the family Rhizocarpaceae. It occurs in Europe, North America, and South Korea.
Xanthoparmelia nortegeta is a species of saxicolous (rock-dwelling), foliose lichen in the family Parmeliaceae, described by John Elix in 2003. This lichen is endemic to Western Australia, particularly the Boyagin Nature Reserve.
Rhizocarpon smaragdulum is a species of crustose lichen belonging to the genus Rhizocarpon in the family Rhizocarpaceae. It was first identified and formally described by Evgeny Davydov and Lidia Yakovchenko in 2014, with the type specimen collected in the Altai Mountains. Characteristics of the lichen include its distinct yellow thallus with greenish patches and a unique reproductive feature of producing a single spore per ascus.
Rhizocarpon austroamphibium is a species of saxicolous (rock-dwelling), crustose lichen in the family Rhizocarpaceae. It is found in alpine environments in southwestern Tasmania, Australia.
Rhizocarpon austroalpinum is a species of saxicolous (rock-dwelling), crustose lichen in the family Rhizocarpaceae. This species can be recognised by its distinctive whitish to pale grey body (thallus) and its large, often partly sunken or barely raised fruiting structures (apothecia). It occurs in Australia.
Rhizocarpon flavomedullosum is a species of saxicolous (rock-dwelling), crustose lichen in the family Rhizocarpaceae. It is native to the Southern Tablelands of New South Wales and the nearby mountain tops in the southern Australian Capital Territory, where it grows on both exposed and sheltered siliceous rocks such as sandstone, schist, and granite.
