Helmut Mayrhofer

Thelenellaceae is a family of lichen-forming fungi. It is the sole family in the monotypic order Thelenellales, and contains three genera and about 50 species.

The Protothelenellaceae are a family of mostly lichen-forming fungi in the order Baeomycetales. The family was established in 1985 and includes three genera with about 22 species worldwide. These fungi typically form thin crusts on rocks, soil, mosses, plant debris, or wood, and are found on nearly every continent. Most family members produce flask-shaped fruiting bodies embedded in their crusty thalli, with spores that have internal dividing walls. The family's evolutionary relationships have been debated, with some scientists arguing whether certain genera should be separated into their own

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Australiaena is a fungal genus in the family Caliciaceae. It is a monospecific genus, containing the single species Australiaena streimannii, a crustose lichen. It occurs in northern Australia and Papua New Guinea, where it grows on silica-rich rocks. The genus was proposed in 1997 and named to reflect both its Australasian distribution and its superficial resemblance to the genus Dimelaena. The lichen forms variable-coloured crusts, ranging from whitish to grey, ochre or brown, with margins that often show distinctive radiating folds. It is distinguished from similar genera by its

Rinodinella is a genus of lichen-forming fungi in the family Physciaceae.

Mobergia is a genus of lichen-forming fungi in the family Physciaceae. The genus name of Mobergia is in honour of Jan Roland Moberg (b.1939), a Swedish botanist (Mycology and Lichenology) and at the Museum of Evolution, Uppsala University. The genus was circumscribed by Helmut Mayrhofer and John Wilson Sheard in Bryologist vol.95 on page 438 in 1992.

Buellia georgei is a species of lichen in the family Caliciaceae. Found in Australia, it was formally described as a new species in 2001 by lichenologists Ulrike Trinkaus, Helmut Mayrhofer, and John Elix. The type specimen was collected in Yanchep National Park (Western Australia); here it was found growing on soft limestone. It has also been recorded from South Australia, New South Wales, and the Australian Capital Territory; preferred habitats are calcareous outcrops, on thin soil over limestone, or rarely on calcareous soil. The lichen produces some secondary compounds: arthothelin as a

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Hafellia is a genus of lichen-forming fungi in the family Caliciaceae. The genus has a widespread distribution, especially in tropical regions. The genus is named in honour of the Austrian lichenologist Josef Hafellner. The genus was proposed by the German lichenologist Klaus Kalb in 1986 to contain two bark-dwelling species, formerly in genus Buellia, with callispora-type spores. These ascospores have ridged walls, and are thin walled at their tips at early states of their differentiation.

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Phaeorrhiza is a genus of lichen-forming fungi in the family Physciaceae.