Josef Poelt

Squamarina is a genus of lichens in the family Stereocaulaceae. They form patches of radiating lobes or overlapping scales (squamules), with a well-developed upper cortex and no lower cortex. They grow on calcareous soil and rocks. Squamarina lentigera can be used to make a yellow dye.

Physconia is a genus of lichen-forming fungi in the family Physciaceae. It comprises 13 species. The genus was established in 1965 by the lichenologist Josef Poelt and is characterized by leaf-like growth forms with lobes typically less than 3 mm wide that often have a whitish, powdery coating on their tips. These lichens can be distinguished from similar genera by their distinctive brown ascospores that have thick walls, fine warts, and a single dividing wall but lack the end thickenings found in related groups.

Seirophora is a genus of lichen-forming fungi in the family Teloschistaceae. It comprises nine species. The genus was erected in 1983, with Seirophora magara assigned as the type species. These lichens form small, shrubby growths with firm, cartilage-like branches that are stiffened by internal cord-like structures and covered with complex surface hairs rather than the simple root-like attachments found in related genera. Several species were transferred to Seirophora in 2004 when the genus was emended by Patrik Frödén and Per Lassen to include some species segregated from Teloschistes.

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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Vezdaea is a genus of crustose lichens in the monotypic family Vezdaeaceae, which itself is the only taxon in the order Vezdaeales. The genus was established in 1976 and named after the Czech lichenologist Antonín Vězda for his contributions to lichen science. These lichens form extremely thin crusts that appear as dustings of tiny greenish to grey particles on decaying moss, plant debris, and soil, particularly in metal-enriched environments that other lichens avoid. The genus contains 14 species.

Umbilicaria americana, commonly known as frosted rock tripe, is a foliose lichen of rock faces.

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

Candelina is a small genus of lichen-forming fungi in the family Candelariaceae. It comprises three species of yellow-colored, rock-dwelling crustose lichens. The lichens grow on sun-baked rocks in desert and semi-desert regions in the Americas and south-western Africa.

Bryonora is a genus of lichen-forming fungi in the family Lecanoraceae. These lichens typically grow on soil, mosses, plant debris, or rocks in arctic or alpine environments. The genus was circumscribed in 1983 by lichenologist Josef Poelt, with Bryonora castanea assigned as the type species.

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Candelina submexicana is a species of saxicolous (rock-dwelling) crustose lichen in the family Candelariaceae. This small lichen forms yellow patches that hug tightly to rock surfaces, with flattened lobes radiating outward from the center. It is closely related to Candelina mexicana but can be distinguished by its smaller size, more reddish-yellow color, and different internal structure. The species grows in sunny, dry locations across Mexico, the southwestern United States, and Peru, typically on exposed non-limestone rocks.

Candelina mexicana is a species of crustose lichen in the family Candelariaceae. This lichen forms bright yellow, rosette-shaped patches on sun-exposed rocks, with narrow lobes radiating outward from the center. It is found across a wide range from the southwestern United States through Mexico to northern South America, typically growing on non-calcareous rocks in arid and semi-arid environments. The species was first discovered in Mexico in the early 1900s and is distinguished from similar yellow lichens by its unique cellular structure and chemical composition.

Caleniopsis is a genus of fungi in the family Gomphillaceae.

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Buellia asterella, commonly referred to as the starry breck lichen, is a rare, black and white lichen in the family Caliciaceae. Once found all across the central European grasslands, it was described as new to science in 1974. Today, it is classified by the IUCN Red List as Critically Endangered and only found in select regions in Norway and Germany.

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