Alan Orange

Lepraria aurescens is a species of leprose lichen in the family Stereocaulaceae. It occurs in Thailand.

Lepraria atlantica is a species of leprose lichen in the family Stereocaulaceae. Described as a new species in 2001, the lichen occurs in Australia, Europe, and Greenland, where it typically grows over rocks and associated mosses.

Anisomeridium robustum is a species of corticolous (bark-dwelling) lichen in the family Monoblastiaceae. It is characterised by its distinctive black, rounded fruiting bodies that can be up to half a millimetre across and sometimes produce visible white strings of spores. The lichen grows in old woodlands and parks across western Britain and Ireland, and has more recently been discovered in South Korea and the Azores.

Verrucaria rosula is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. It is known from several European countries, including Britain and France. The lichen is characterised by its distinctive growth pattern, forming rosette-like patches that merge together as they develop—a feature that inspired its name rosula (meaning "little rose"). Its thallus varies from grey-green to brown, depending on light exposure, and features rounded reproductive structures with pale openings. V. rosula typically occurs on damp rocks and stones near streams or on

Verrucaria madida is a species of saxicolous (rock-dwelling), aquatic, crustose lichen in the family Verrucariaceae. Found in Europe, it was formally described as a new species in 2004 by British lichenologist Alan Orange. The type specimen was collected by the author west of Murat, Cantal, France at an altitude of about 1,000 m (3,300 ft). There it was growing on shallowly submerged rocks in a lightly shaded woodland stream. The lichen has a thin, smooth, dark green to dark greenish-grey thallus with a somewhat gelatinous consistency. The asci (spore-bearing structures) of Verrucaria madida

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Lepraria sylvicola is a species of leprose lichen in the family Stereocaulaceae. This crust-forming lichen grows primarily in woodlands across western Britain and Ireland. It appears as a powdery, bluish-white to pale blue-grey coating on tree bark and occasionally on rock surfaces. The species is particularly common on mature sessile oak trees in natural and semi-natural woodlands, where it often grows alongside mosses and other lichens. The species can be distinguished from similar-looking lichens by its unique combination of chemical compounds, which include roccellic acid and

Lepraria pulchra is a species of dust lichen in the family Stereocaulaceae. Found in Thailand, it was described as a new species in 2005. It contains thamnolic acid as its primary lichen product.

Lepraria humida is a species of leprose lichen in the family Stereocaulaceae. Found in northern Europe and northeastern North America, it grows on siliceous rocks, often between mosses, typically on rain-sheltered damp surfaces.

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Lithocalla is a small genus of lichen-forming fungi in the family Ramalinaceae. It comprises two known species that form crust-like growths with a powdery texture on rocks. The genus was established in 2020 based on genetic analysis of species previously classified under different genera. Lithocalla lichens are characterised by their pale yellow-green colour and their preference for sheltered, shaded rock surfaces. They lack visible reproductive structures and likely spread through fragmentation. The two species have distinct geographical distributions: L. ecorticata is found mainly in Great

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Verrucaria placida is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in freshwater habitats in Europe, Verrucaria placida has been recorded in Norway, southern Germany, and Wales, where it occurs in small streams and grows on shaded siliceous rocks and stones.

Verrucaria nodosa is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. It is found in freshwater habitats in north Wales.

Verrucaria hydrophila is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in freshwater habitats in Europe, it was formally described as a new species in 2013 by lichenologist Alan Orange. The type specimen was collected by the author from Melindwr, Coed y Fron Wyllt (Bontuchel, Wales), where it was found in a woodland growing on a shaded stone in a stream. The lichen has a thin, smooth, grey-green to brownish thallus that is somewhat translucent when wet. It is widespread in Europe and the British Isles, where it grows on rocks and stones in

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Tephromela lignicola is a species of lignicolous (wood-dwelling), crustose lichen in the family Tephromelataceae. It is found in the Falkland Islands, where it grows on fenceposts and similar timber.

Porina rivalis is a rare species of semi-aquatic, saxicolous (rock-dwelling), and crustose lichen in the family Porinaceae. First formally described in 2015, it had previously been misidentified as Porina lectissima. The lichen features a thin, light orange-brown to grey-brown thallus and dark reproductive structures called perithecia. It specifically inhabits siliceous rocks in streams with moderate pH levels that are neither strongly acidic nor nutrient-rich, where it associates with other semi-aquatic lichens and bryophytes. Classified as "Nationally Rare" in Britain, P. rivalis is best

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Hydropunctaria orae is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. It is a marine lichen. It forms thin, dull mid-green to dark greenish-grey crusts on coastal rock surfaces, particularly in areas that receive slight moisture from rainfall. Although difficult to distinguish from related species without DNA analysis, it can be identified by its green cortical pigments and minutely roughened surface texture. Initially known only from two localities in the British Isles, the species was later discovered in southwestern Norway in 2014. It occupies

Hydropunctaria oceanica is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. Described as new to science in 2012, it is a marine lichen. It forms thin, dark grey-brown to brown-black crusts on rock surfaces along the seashore, often in areas that receive occasional rainfall. It is characterised by its roughened surface texture, large photobiont cells, and distinctive reproductive structures. Although similar in appearance to the common littoral zone lichen Hydropunctaria maura, with which it often grows, H. oceanica is genetically distinct. At the time of

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Flavoplaca sol (formerly Caloplaca sol) is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. It is found on limestone and basic siliceous rocks along the southern and western shores of Great Britain.