Philippe Clerc

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Usnea galapagona is a species of beard lichen in the family Parmeliaceae. It is endemic to the Galápagos Islands. The lichen is easily recognized by its special structure. It has a tough, glass-like outer layer, a thick central core, and a very faint, almost invisible inner layer. This lichen stands upright and has a reddish colour near its base. Its branches split unevenly and are generally few in number, without any small, hair-like structures.

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Usnea subflammea is a species of beard lichen in the family Parmeliaceae. It is characterized by its typically pendulous (hanging) growth form, thick cortex, and distinctive stipitate (stalked) soralia that develop at the tips of eroded tubercles (small bumps). This species occurs in the Azores and Canary Islands, and various countries in Central and South America.

Usnea subdasaea is a species of beard lichen in the family Parmeliaceae. It has an erect, shrubby growth form, typically reaching about 7 cm (2.8 in) long, and often has a faint reddish tinge due to an orange pigment layer beneath the surface. The species bears minute powdery patches and abundant fine outgrowths on its branches. It occurs in the Galápagos Islands and in the tropical Andes from Bolivia to Venezuela, with an outlying record from Florida.

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Usnea oreophila is a little-known species of saxicolous (rock-dwelling) beard lichen in the family Parmeliaceae. Found in high-altitude regions of Brazil, it was formally described as a new species in 2019 by Alice Gerlach and Philippe Clerc.

Usnea macaronesica is a species of beard lichen in the family Parmeliaceae. Characterized by its shrubby greenish-yellow appearance growing 2–5 cm in length, it features distinctive large, excavated reproductive structures and a unique chemical composition. Originally discovered in Macaronesia (the Azores and Canary Islands) where it grows in forest ecosystems, it was later found in coastal areas of North America, specifically Maine and Nova Scotia, where it typically grows on conifers near shorelines. This lichen is related to several other Usnea species but can be distinguished by its

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Usnea krogiana is a species of beard lichen in the family Parmeliaceae. It is characterized by its shrubby, rigid growth form reaching 2–8 cm in length, a distinctive jet-black basal trunk with thin ring-like cracks, an extremely thick central axis (50–80% of branch diameter), small dot-like reproductive structures (soralia), and the presence of usnic acid in its outer layer and stictic acid group compounds in its inner layer. The lichen is primarily found in Macaronesia (the Azores and Canary Islands) at elevations between 280 and 1400 metres, has been collected in the West Indies, and was

Usnea grandisora is a species of beard lichen in the family Parmeliaceae. It is known from the Galápagos Islands and has also been reported from Venezuela. It has an erect, shrubby growth form reaching about 8 cm (3 in) long, with an orange pigment layer beneath the surface and large powdery patches used for reproduction. The species grows on bark and wood in open habitats, from farmland edges to humid-zone woodlands.

Usnea geissleriana is a species of beard lichen in the family Parmeliaceae. It is a long, pendulous lichen found primarily in Macaronesia (the Azores and Canary Islands), where it grows in cloud forests and laurel forests. It has also been recorded from Gough Island in the South Atlantic Ocean, and several countries in South America.

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Usnea crocata is a species of beard lichen in the family Parmeliaceae. It has an erect to somewhat hanging, shrubby growth form, reaching up to 20 cm (8 in) long, and bears minute powdery patches used for reproduction. The species is distinguished by an orange pigment layer beneath the outer surface that can give the whole thallus an orange tinge. It is endemic to the tropical Andes, where it grows on trees and shrubs in mountainous cloud forests and open pastures.

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Usnea viktoriana is a shrubby to somewhat pendulous beard lichen in the family Parmeliaceae. It was described in 2018 by Philippe Clerc and Volker Otte from European material that had been placed in U. diplotypus or treated as an alectorialic acid chemotype. It belongs to the U. barbata–dasopoga group and was recognised as a distinct species using a combination of morphology, chemistry and DNA data. Chemically it is characterised by the secondary metabolite alectorialic acid in high concentration in the soralia, although some collections instead contain salazinic acid or show no detectable

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Usnea subcomplecta is a species of fruticose lichen in the family Parmeliaceae. It is found in the Galápagos Islands. It is characterized by its flaccid branches, blackened trunk, and pruinose cortex surface.

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