Volkmar Wirth

Megaspora is a genus of lichen-forming fungi in the family Megasporaceae. It contains four species of crustose lichens that typically grow on soil, bryophytes (mosses and liverworts), or plant litter on chalky substrates.

Fuscidea is a genus of crustose lichens in the family Fuscideaceae. It has about 40 species. The genus was established in 1972 by Volkmar Wirth and Antonín Vězda, with its name derived from the Latin for 'brown', referring to the typical colouration of these lichens. Species of Fuscidea grow almost exclusively on acidic, silica-rich rocks, favouring steep faces in humid, high-rainfall regions such as Atlantic coastlines and mountain ranges. They form cracked or patchy crusts that spread over a characteristically dark underlying margin, often creating mosaic-like patterns where neighbouring

Placopsis lambii is a species of saxicolous (rock-dwelling), crustose lichen in the family Trapeliaceae. It was formally described as a new species in 1987 by lichenologists Hannes Hertel and Volkmar Wirth. The species epithet lambii honours polar explorer and lichenologist Elke Mackenzie (formerly Lamb). In North America, one vernacular name for the lichen is pink bull's-eye lichen. Placopsis lambii is distinguished by its placodioid thallus that features deeply notched and radiating edge lobes, a glossy upper surface, typically dark and somewhat rounded soralia, and non-lobate cephalodia

Buellia peregrina is a species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae. It is found in the Namib desert in Namibia.

Rhizocarpon furax is a species of lichen in the family Rhizocarpaceae. It is found in Europe, where it has a scattered distribution. Rhizocarpon furax is a lichenicolous fungi, meaning that it grows on the thallus of other lichens. It was originally reported from Lecidea swartzioidea but has since been reported growing on Lecidea lapicida and Tremolecia atrata.

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Badimia vezdana is a species of foliicolous (leaf-dwelling) lichen in the family Ramalinaceae. It is found in the shady understory of undisturbed lowland rainforests in the Neotropics. The lichen is characterized by its pale bluish-grey colour and distinctive yellow to orange-yellow apothecia. It was described as new to science in 2011 by lichenologists Robert Lücking, Edit Farkas, and Volkmar Wirth.

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Gyalectidium conchiferum is a leaf-dwelling (foliicolous) species of lichen-forming fungus in the family Gomphillaceae. It is known from the Valdivian temperate rainforest of southern Chile, where it forms small greenish-gray patches on living leaves. The species is characterized by its distinctive mussel-shaped reproductive structures that stand upright at the thallus margin, which distinguish it from similar smooth-thallusеd species in the genus.

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Bacidina adastra is a species of corticolous (bark-dwelling) leprose lichen in the family Ramalinaceae. The lichen has a distinctive thick, powdery, bright yellowish-green thallus, forming patches up to half a metre in diameter. First described in 2003 from the Netherlands, it has since been documented throughout Western and Eastern Europe in countries including Belgium, England, Germany, Poland, Russia, and Sweden. The lichen primarily grows on tree bark, especially on nutrient-enriched bases of trees like poplar, willow, and elm, though it can occasionally be found on wood, soil, and rock.

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