Georg Franz Hoffmann

Lobaria pulmonaria is a large epiphytic lichen consisting of an ascomycete fungus and a green algal partner living together in a symbiotic relationship with a cyanobacterium—a symbiosis involving members of three kingdoms of organisms. Commonly known by various names like tree lungwort, lung lichen, lung moss, lungwort lichen, oak lungs or oak lungwort, it is sensitive to air pollution and is also harmed by habitat loss and changes in forestry practices. Its population has declined across Europe and L. pulmonaria is considered endangered in many lowland areas. The species has a history of use

Cladonia pyxidata or the pebbled cup lichen is a species of cup lichen in the family Cladoniaceae. It is host to the lichenicolous fungus Lichenoconium pyxidatae. In Nepal, Cladonia pyxidata has been reported from 4,000 to 4,100 m elevation in a compilation of published records.

Stereocaulon is a genus of lichens. Members of Stereocaulon are commonly called rock foam lichens. Photobiont partners of Stereocaulon include green algae from the genera Asterochloris, Chloroidium, and Vulcanochloris. Stereocaulon is difficult to ID to species, but there is a high diversity of species within the genus.

Cladonia macilenta or the lipstick cup lichen is a species of cup lichen in the family Cladoniaceae. The species is red listed in Iceland as an endangered species (EN). While it is found in various regions of the UK, it is considered potentially threatened in parts of the lowlands due to habitat loss. Verrucaster lichenicola, described by Friedrich Tobler in 1913, was proposed to be a fungus with waxy pycnidia and hyaline conidia lacking septa. It was, however, a little-known taxon, as the type specimen was lost and not collected again. The rediscovery of the type material more than a century

Cladonia deformis, also known as the lesser sulphur cup or the lesser sulphur cup lichen, is a light-coloured, fruticose, cup lichen belonging to the family Cladoniaceae. This lichen was first described as Lichen deformis by Carl Linnaeus in 1753, and transferred to the genus Cladonia in 1796 by Georg Franz Hoffmann. As of July 2021, its conservation status has not been estimated by the IUCN. In Iceland, its conservation status is denoted as data deficient (DD).

Stereocaulon paschale is a species of lichen belonging to the family Stereocaulaceae. It has a cosmopolitan distribution. In Iceland, it has the conservation status of a vulnerable species (VU).

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Peltigera venosa, commonly known as the fan lichen, is a species of foliose lichen in the family Peltigeraceae. It was first described by Carl Linnaeus in his 1753 work Species Plantarum as Lichen venosus. German botanist Georg Franz Hoffmann transferred it to the genus Peltigera in 1789. P. venosa can be found in temperate and boreal regions of North America, Europe, and Asia, while occasionally being found in drier climates such as mountainous Arizona. The thallus color depends on its level of hydration: when wet, it is deep green, while when dry it is dark grey-green. The lobes that

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Usnea articulata, commonly known as the string-of-sausage lichen, is a pale greenish-grey, densely branched lichen with a prostrate or pendant growth form. It grows on bark, on branches and twigs, and is often unattached to a branch and merely draped over it. It grows up to 100 cm (40 in) in length.

Umbilicaria hyperborea, commonly known as blistered rock tripe, is a species of foliose lichen in the family Umbilicariaceae. It is widely distributed in arctic and alpine regions.

Cladonia turgida or the crazy-scale cup lichen is a species of cup lichen in the family Cladoniaceae. Cladonia turgida contains atranorin and fumarprotocetraric acid with the latter compound sometimes in low quantities.

Cladonia phyllophora, the felt Cladonia, is a widely distributed species of fruticose lichen in the family Cladoniaceae. It was described as a new species in 1796 by the German naturalist Georg Franz Hoffmann. The lichen, which grows on rotting wood and on soil in both open and shaded environments, has been recorded from Antarctica, Asia, Europe, North America, Oceania, and South America.

Cladonia parasitica, commonly known as the fence-rail cladonia, fence-rail cup lichen or parasite club lichen, is a species of fruticose, cup lichen in the family Cladoniaceae. It was first described by Hoffmann in 1784 under the name Lichen parasiticus, until he reclassified it under the genus Cladonia in 1795.

Ramalina dilacerata, commonly known as punctured ribbon lichen, is a lichen species belonging to the family Ramalinaceae. The species was first described in 1796 as Lobaria dilacerata Hoffm., and later transferred to the genus Ramalina by Hoffmann in 1825.

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Cladonia squamosa or the dragon cup lichen is a species of cup lichen in the family Cladoniaceae.

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