Leif Tibell

The Mycocaliciales are an order of ascomycetous fungi within the subclass Mycocaliciomycetidae and within the class Eurotiomycetes (subphylum Pezizomycotina).

Atla is a genus of crustose lichens in the family Verrucariaceae. It has nine species that grow on rocks or on soil.

Thelomma santessonii, the tan nipple lichen, is a species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae. Found in northern North America, it was formally described as a new species in 1976 by lichenologist Leif Tibell. It is endemic to the coast and islands of Southern California and Baja California in Mexico. Thelomma santessonii has a yellowish tan color, and is areolate. The thallus has verrucae that measure up to 2.5 mm (0.10 in) broad. The expected results of chemical spot tests are KC− on the thallus, and K+ (red), P+ (yellow) on the mazaedia. When a

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Chaenotheca brachypoda is a species of lichen in the family Coniocybaceae. This tiny pin lichen is almost invisible except for its minute fruiting structures that rise like microscopic pins from tree bark, each topped with a yellow-green, frost-like coating containing distinctive acids. Originally described in 1816 from specimens growing on pine logs in Sweden, it lives mostly hidden within the bark of its host tree, with only hair-fine stalks extending upward to release powdery spores from spherical heads barely 0.2 mm across.

Tetramelas pulverulentus is a species of lichenicolous (lichen-dwelling) fungus in the family Caliciaceae. Originally described from Italy in 1860, this inconspicuous fungus lives hidden within the white inner tissue (medulla) of its host lichen rather than forming a visible crust on the surface. It produces tiny black fruiting bodies that contain brown ascospores and is distinguished from related species by having spores divided into three compartments (septa).

Tetramelas phaeophysciae is a species of lichen-forming fungus in the family Caliciaceae. It is a lichenicolous (lichen-dwelling) species that grows on other lichens, primarily Phaeophyscia and Physcia species on rocks. Found in arctic to subalpine climates, records are documented from Scandinavia, Greenland, Iceland, and parts of central and northern Asia. The species was described in 2005 after DNA evidence showed it was distinct from the closely related Tetramelas pulverulentus.

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Phaeocalicium polyporaeum, the fairy pin or common pin, is a species of non-lichenized fungus in the genus Phaeocalicium. They grow to a maximum size of 2.5 mm and resemble black matchsticks, with thin stalks and wider caps, in groups or rows primarily on the caps of Trichaptum biforme. Fairy pins are a type of parasitic fungi that grow primarily on the caps of Trichaptum biforme, but have also been reported on Trametes versicolor. They often co-occur on the upper side of caps with green algae on host fungi. Fairy pins can be distinguished from other species of Phaeocalicium by their spores,

Microcalicium is a genus of lichen-forming fungi in the order Pertusariales. It is the only genus in the monotypic family Microcaliciaceae. These taxa were circumscribed by the Finnish lichenologist Edvard August Vainio in 1927, with Microcalicium disseminatum assigned as the type species.

Chaenothecopsis vainioana is a species of tiny, pin-like fungus that lives on lichens and algal colonies, belonging to the family Caliciaceae. The species is named in honour of the Finnish lichenologist Edvard August Vainio. These fungi produce distinctive black, stalked structures resembling miniature matchsticks that measure less than a millimetre in height, with oval-shaped heads containing spores. They typically grow on the surfaces of lichens containing specific types of green algae, particularly favouring old oak trees in partially open woodland areas across several European countries.

Chaenotheca furfuracea is a mealy (farinaceous), bright yellow-green leprose pin lichen. It is in the family Coniocybaceae. This distinctive lichen forms vivid yellow-green powdery crusts on tree bark and produces tiny pin-like fruiting bodies up to 2 mm tall, each with a hair-thin stalk topped by a spherical head. It grows in damp, deeply shaded locations such as tree root crevices and rocky overhangs, particularly in upland areas of Europe where it grows mainly on beeches, oaks, and spruce roots.

Calicium victorianum is a lichen-forming fungus in the family Caliciaceae. This tiny lichen is almost invisible to the naked eye, living inside weathered wood and producing minute, bell-shaped fruiting bodies that look like dark specks on the surface. Originally discovered in Australia in 1889 growing on Eucalyptus fence posts, it specialises in colonising hard, sun-exposed wood that has been naturally weathered. The species has an unusual distribution, being found in Australia, New Zealand, and also at a single site in southern England, making it one of the few lichens with such a widely

Atla wheldonii is a species of terricolous (ground-dwelling), crustose lichen in the family Verrucariaceae. Found in Europe, it was formally described as a new species in 1947 by William Gladstone Travis from specimens collected from sand dunes in Lancashire, England, in 1924. Sanja Savić and Leif Tibell transferred the taxon to genus Atla in 2008 following molecular phylogenetic analysis that showed that it, along with three other Northern European species, comprised a distinct clade in the Verrucariacae. In additional to the British Isles, Atla wheldonii has also been recorded in the

Atla praetermissa is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It forms a very thin, mesh-like thallus that varies in colour from grey to dark green, sometimes with a brownish tint. The species is characterised by small, spherical reproductive structures and hyaline spores with a distinctive internal wall structure. First described in 2008, this lichen grows specifically on calcareous rocks near streams and in waterfall spray zones at elevations between 165 and 955 metres. Although known only from Scandinavia (Sweden and Norway), experts suggest it

Atla palicei is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. It forms a thin, blackish-brown to black growth with a scurfy appearance and a diffusely areolate pattern on its substrate. The lichen contains a complex mixture of photobionts, including an unidentified green alga and cyanobacteria from the genera Nostoc and Chroococcus. It is characterised by small hemispherical perithecia (averaging 0.46 mm in diameter) that emerge from small areolae, with each perithecium surrounded by a cuff-like structure. The species was formally described in 2008

Atla alpina is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae, and the type species of the genus Atla. Found in Europe, it was formally described as a new species in 2008 by Sanja Savić and Leif Tibell. The type specimen was collected near Djupdalsvallen (Mittåkläppen, Härjedalen, Sweden) at an altitude of 1,170 m (3,840 ft), where it was found growing on northwest-facing, vertical slate rocks. In addition to Sweden, the lichen has been recorded from Scandinavia, Spitsbergen, Novaya Zemlya, Austria, and Germany, at elevations ranging from 345 to 2,700 m

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Texosporium is a genus of lichenized fungi in the family Caliciaceae. It is a monotypic genus, containing the single species Texosporium sancti-jacobi, found in the United States. The genus is characterized by microscopic features: the ascospores are coated with a layer of cells that are derived from the paraphyses. Texosporium was originally circumscribed by Josef Nádvorník in 1942, albeit the name was not validly published. In 1968, Leif Tibell and Angelica van Hofsten published the name validly. In 2020, Texosporium sancti-jacobi was added to the global IUCN Red List, where it is

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