Monotypic Lecanoromycetes genera

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 thread-like

Catolechia is a genus of lichen-forming fungi in the family Rhizocarpaceae. It is a monotypic genus, containing the single species Catolechia wahlenbergii. The genus was circumscribed by the German botanist Julius von Flotow in 1850. He did not assign a type species for the genus; Catolechia pulchella was designated as the type by Gustav Wilhelm Körber in 1855. This species is synonymous with Catolechia wahlenbergii.

Tholurna is a fungal genus in the family Caliciaceae. The genus is monotypic, containing the single species Tholurna dissimilis. Long thought to be confined to Scandinavia, it has since been recorded in western North America, where a 1983 survey documented 47 localities from coastal British Columbia to Oregon and as far north-east as the Yukon and Northwest Territories.

Gallaicolichen is a fungal genus that contains the single species Gallaicolichen pacificus, a foliicolous (leaf-dwelling) lichen. Originally discovered in Hawaii in 2007, G. pacificus has since been found in various locations across the Pacific, including Australia, New Caledonia, Vanuatu, the Philippines, and Japan. The lichen forms small, pale greenish-yellow to yellowish-grey patches on leaves, typically in mid-altitude forests and along forest edges. G. pacificus is notable for its unique reproductive structures called , which produce disc-shaped propagules (peltidia) for asexual repr

Anzina is a fungal genus of uncertain familial and ordinal classification in the subclass Ostropomycetidae. It is monotypic genus, containing the single crustose lichen species Anzina carneonivea. The lichen occurs mainly in mountainous regions of Europe and western North America, where it grows on the bark of coniferous trees and on decaying organic matter. The genus name honours the Italian botanist Martino Anzi, who first described the species in 1868. The genus was established more than a century later, after microscopic work indicated that the species had a distinctive set of .

Romjularia is a fungal genus in the family Lecideaceae, containing the single species Romjularia lurida, a saxicolous and terricolous (rock- and ground-dwelling) squamulose lichen.

Pachyphysis is a fungal genus in the family Lecideaceae. It is a monotypic genus, containing the single species Pachyphysis ozarkana, a lichen. It is a crust-forming lichen that grows on limestone and dolomite rocks in open, sunny habitats, and is often inconspicuous because its main body develops within the rock surface rather than on top of it. The species has a restricted range in the eastern and central United States, centred on the Ozarks, and is associated with landscapes that were not covered by ice sheets during the last ice age.

later homonym, do not use

Acroscyphus is a fungal genus in the family Caliciaceae. This is a monospecific genus, containing the single fruticose lichen species Acroscyphus sphaerophoroides. It is found in various locations in the cordilleras of western North America, including Mexico and British Columbia, as well as high-elevation, exposed regions of Asia (China, Japan), South Africa, Peru, and Patagonia. Commonly known as '''crab's eye lichen''', it forms distinctive cushion-like growths with finger-shaped branches and has a yellow to orange interior. The species typically grows on exposed rocks or dead wood in harsh,