Harrie Sipman

Hypotrachyna is a genus of lichenized fungi within the family Parmeliaceae. According to the Dictionary of the Fungi (10th edition, 2008), the widespread genus contains about 198 species. Hypotrachyna was circumscribed by American lichenologist Mason Ellsworth Hale Jr in 1974.

The Trypetheliales are an order of fungi in the class Dothideomycetes. Most of the species in the order form lichens, although some are lichenicolous fungi. Trypetheliales contains two families, Polycoccaceae and Trypetheliaceae.

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Lithothelium fluorescens is a species of corticolous (bark-dwelling), crustose lichen in the family Pyrenulaceae. It is known from montane rainforest sites in Puntarenas Province, Costa Rica, where it was collected on bark on the lower trunk. The lichen is identified mainly by microscopic characters in its flask-shaped fruiting bodies (perithecia) and ascospores, rather than by any obvious surface features. The thallus is ochraceous and has a cortex, and the perithecia are mostly immersed but show as small, hemispherical warts. In standard lichen spot tests, the thallus fluoresces yellow

Lepraria impossibilis is a species of leprose lichen in the family Stereocaulaceae. It forms a powdery to membranous thallus with a well-defined margin and distinctive secondary metabolites, including lecanoric acid and pannaric acid 6-methylester. The species is morphologically similar to Lepraria cupressicola and L. vouauxii but can be distinguished by its chemical composition. Lepraria impossibilis grows on tree bark, mosses, and soil-covered rocks, occurring in forested and open habitats across South and Central America, including El Salvador, Bolivia, Chile, and Peru, as well as in Iran.

Hypotrachyna anzeana is a species of foliose lichen in the family Parmeliaceae. It occurs in the Andes of Colombia and Bolivia, where it grows over moss cushions on acidic rocks at an elevation of 3,500–3,900 m (11,500–12,800 ft). The specific epithet honours the collector of the type specimen, the environmental biologist Rafael Anze Martin.

Hypotrachyna ahtiana is a species of foliose lichen in the family Parmeliaceae. It is known only from the type locality in Venezuela, where it was collected in the Guyana Shield at an elevation of 1,950 m (6,400 ft). It is named to honour Finnish lichenologist Teuvo Ahti.

Hypotrachyna is a species of foliose lichen in the family Parmeliaceae. Originally described from specimens collected in Venezuela, it is found in mountains throughout the Neotropics, where it grows on pine and hardwood bark.

Gyalideopsis wesselsii is a species of corticolous (bark-dwelling) crustose lichen in the family Gomphillaceae. The pale greenish-grey lichen forms thin, shiny crusts with a warty surface on bark and rotting logs in cloud forest environments, and is known only from two locations in Costa Rica at elevations between 100 and 700 m (330 and 2,300 ft). It can be distinguished from closely related species by its tiny, narrowly spoon-shaped reproductive structures, dark greyish-brown fruiting bodies with triangular projections when young, and by producing a single large spore per spore sac rather

Cladonia monomorpha is a species of terricolous (ground-dwelling), fruticose lichen in the family Cladoniaceae. It is part of the Cladonia pyxidata group, known for brown apothecia on cup-shaped podetia.

Aspidothelium glabrum is a species of corticolous (bark-dwelling), crustose lichen in the family Thelenellaceae. It was described in 2008 from material collected on bark in western Costa Rica, and has since been recorded in Brazil. The lichen forms pale mineral-gray patches that may be edged by a thin black border, and it produces tiny, glossy, cream-to-gray bumps on the surface that contain its spores. Under the microscope, its spore-producing sacs contain four colorless spores that are divided into many small compartments, a feature used to separate it from similar species.

Aptrootia is a genus of fungi in the family Trypetheliaceae. It has four species. The genus was circumscribed by Robert Lücking and Harrie Sipman in 2007, with Aptrootia terricola assigned as the type species. This species, originally described by Dutch mycologist André Aptroot as a species of Thelenella, is known from Papua New Guinea and Costa Rica. Later molecular work showed that the species did not belong in Thelenella (Aptroot himself had expressed doubt about this generic placement), but rather, in the Trypetheliaceae, with a sister taxon relationship to a branch including Bathelium

Acarospora pseudofuscata is a species of saxicolous (rock-dwelling) crustose lichen in the family Acarosporaceae. It occurs on a few islands in the Aegean Sea and in Turkey.

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Pertusaria pseudoparotica is a species of saxicolous (rock-dwelling), crustose lichen in the family Pertusariaceae. It is known from a few localities in Greece's Aegean Islands.

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Hypotrachyna vainioi is a species of foliose lichen in the family Parmeliaceae. It is found in Brazil.

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