Maurice Choisy

Parmotrema perlatum, commonly known as the powdered ruffle lichen, is a common species of foliose lichen in the family Parmeliaceae. The species has a cosmopolitan distribution and occurs throughout the Northern and Southern Hemispheres. Parmotrema perlatum is a prominent and widely recognised species within its genus across primarily temperate zones, preferring humid, oceanic-suboceanic habitats. It is found in diverse geographic areas including Africa, North and South America, Asia, Australasia, Europe, and islands in the Atlantic and Pacific oceans. It usually grows on bark, but

Trapelia is a genus of lichen-forming fungi in the family Trapeliaceae. These lichens form tight, crusty patches on rocks and bark that may appear smooth at first but often crack into small plates over time. The genus was established by the French lichenologist Maurice Choisy in 1929 and contains more than 20 species found worldwide. Most species reproduce through small, disc-shaped fruiting bodies that range from pale pink-brown to nearly black, and many can be identified by specific chemical compounds they produce.

Trapelia coarctata is a lichenised fungus in the family Trapeliaceae. It was first described as Lichen coarctatus in 1799 by Dawson Turner in Smith & Sowerby's, English Botany., and transferred to the genus Trapelia by Maurice Choisy in 1932. It has been found in mallee woodland dry sclerophyll forest, on soil and rocks, in Western Australia, and on Kangaroo Island in South Australia. It has a continuous grey thallus, containing gyrophoric acid, and is a first coloniser after fire. It was among the first lichen species to be found on Surtsey island after its inception from the sea.

Protoparmelia is a genus of lichenized fungi in the family Parmeliaceae. The genus has a widespread distribution, and contains 11 species. Protoparmelia was circumscribed by French lichenologist Maurice Choisy in 1929.

Lecidella elaeochroma is a species of fungus belonging to the family Lecanoraceae. It has cosmopolitan distribution.

Pseudephebe is a genus of fruticose lichens in the family Parmeliaceae. It contains three species that grow on rocks.

Anisomeridium is a genus of lichen-forming fungi in the family Monoblastiaceae. These lichens form thin, nearly invisible crusts that grow mostly embedded within the bark of trees or other surfaces. They are distinguished by their tiny flask-shaped fruiting bodies and distinctive spores that have internal cross-walls positioned closer to one end than the other.

Tephromela is a genus of lichens in the family Tephromelataceae. There are about 50 species in this widespread genus. The genus was established in 1929 by the French lichenologist Maurice Choisy, who separated these species from the broader genus Lecanora based on their distinctive straight asexual spores and dark violet spore-bearing layers. These rock and bark-dwelling lichens are characterized by their white to pale grey crusty growth and black disc-shaped reproductive structures with purple-tinted interiors.

The Sphinctrinaceae are a family of fungi in the order Mycocaliciales.

Psilolechia lucida is a species of saxicolous lichen in the family Psilolechiaceae. It is widely distributed through the world, where it grows on natural and artificial rocky substrates in the shade, often in sheltered underhangs. It forms a greenish crust on the surface of its substrate.

Tremolecia is a small genus of lichen-forming fungi in the family Hymeneliaceae. Its two accepted species form thin crusts on rock and are recognised by their dark, cup-shaped fruiting bodies (apothecia). The better-known species, Tremolecia atrata, is widespread on iron-rich rocks in mountainous and arctic regions.

Protoparmeliopsis is a genus of saxicolous (rock-dwelling, crustose lichens in the family Lecanoraceae. It has about 20 species. The genus was circumscribed by French botanist Maurice Choisy in 1929.

Parmotrema crinitum, the salted ruffle lichen, is a species of corticolous (bark-dwelling), foliose lichen in the family Parmeliaceae. It was formally described as a new species in 1814 by the Swedish lichenologist Erik Acharius, as Parmelia crinita. Maurice Choisy transferred it to the genus Parmotrema in 1952.

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Pseudephebe pubescens, also known as 'fine rock wool', is a temperate alpine lichen. It is a member of the genus Pseudephebe, a lichen group characterized by dense mats of brown to near-black "hairs".

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Hypocenomyce is a genus of lichen-forming fungi in the family Ophioparmaceae. Species in the genus grow on bark and on wood, especially on burned tree stumps and trunks in coniferous forest. Hypocenomyce lichens are widely distributed in the northern hemisphere.

Pseudosagedia is a genus of corticolous (bark-dwelling) lichens in the family Porinaceae. It was first circumscribed as a section of genus Arthopyrenia by Swiss botanist Johannes Müller Argoviensis in 1862. Maurice Choisy elevated it to distinct generic status in 1949. Pseudosagedia was little used until, in 1995, Josef Hafellner and Klaus Kalb resurrected the genus to contain members of the Porina nitidula species group with the perithecial pigment called Pseudosagedia-violet and lacking setae.

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Straminella is a genus of lichen-forming fungi in the family Lecanoraceae. Species in this genus typically form yellow-green to beige crusts on bark or wood and are characterised by pale to brownish fruiting bodies. The genus contains usnic acid as its main secondary metabolite, with most species also producing psoromic acid. It has a scattered distribution across North America, North Africa, Europe, East Asia, and Australia.

Parmotrema reticulatum is a lichen in the ruffle lichen family, the Parmeliaceae.

Leptochidium is a genus of lichen-forming fungi in the family Massalongiaceae. It has two species: Leptochidium albociliatum (Desm.) M.Choisy (1952) Leptochidium crenatulum (Nyl.) P.M.Jørg. (2006) The genus was circumscribed by French lichenologist Maurice Choisy in 1952. Leptochidium remained monotypic until 2006, when Per Magnus Jørgensen transferred into it a species originally named Leptogium rivulare var. crenatulum by William Nylander.

Lecanoropsis is a genus of crustose lichens in the family Lecanoraceae. Species in this genus grow mainly on bark and wood, where the body of the lichen is often largely embedded in the substrate rather than forming a conspicuous surface crust. Chemically, they are characterised by usnic acid or the related compound isousnic acid. The genus was validated in 2025 following a molecular study that confirmed it as a distinct lineage, with six species described as new to science in the same revision.

Glaucomaria is a genus of lichen-forming fungi in the family Lecanoraceae. Species in this genus have a crust-like growth form and are distinguished by their heavily powdery fruiting bodies, which produce a bright lemon-yellow colour when treated with bleach. The genus occurs on both tree bark and siliceous rock across most continents, though it is absent from Antarctica. All species produce the compounds sordidone and atranorin as their main secondary metabolites.

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Aspiciliopsis is a genus of lichen-forming fungi in the family Trapeliaceae. It has two species, both of which occur in the Southern Hemisphere.

Aspiciliella is a genus of lichen-forming fungi in the family Megasporaceae. It has four species. The genus is characterised by its crustose, rimose-areolate thallus that is partially continuous and has a K+ (red) reaction. The epihymenium is typically green to olive-green and turns light green when treated with N (N+ light green). Aspiciliella has eight-spored asci of the Aspicilia-type, containing ellipsoid, colourless, and simple ascospores.

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