Johann Christian Daniel von Schreber

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Physcia is a genus of lichen-forming fungi in the family Physciaceae. The widely distributed genus contains about 80 species. The genus is cosmopolitan, and has been extensively studied in various regions in the past several decades, with significant biodiversity in South America identified as a central diversity hotspot. Physcia species are foliose, lobate lichens that grow with a loose to close appressed habit. Their upper surface is typically whitish, pale greenish, green-grey, or dark grey in colour. The thallus colour remains relatively unchanged when moistened. Physcia lichens typically

Cetraria aculeata, the spiny Iceland lichen, is a dark brown to black fruticose lichen in the family Parmeliaceae. First described by Schreber in 1771 as Lichen aculeatus, it was transferred through several genera before being placed in Cetraria. The thallus forms shrubby tufts up to 5 cm (2.0 in) tall and reproduces mainly by fragmentation rather than ascospores. The species has a wide, bipolar distribution, occurring from the maritime Antarctic to the high Arctic and, at intermediate latitudes, in montane, steppe, and coastal habitats. Phylogeographic evidence suggests it evolved in the

Lecanora muralis (Protoparmeliopsis muralis) is a waxy-looking, pale yellowish-green crustose lichen that usually grows in rosettes radiating from a center (placodioid) filled with disc-like yellowish-tan fruiting bodies (apothecia). It grows all over the world. It is extremely variable in its characteristics as a single taxon, and may represent a complex of species. The fruiting body parts have rims of tissue similar to that of the main nonfruiting body (thallus), which is called lecanorine. It is paler and greener than L. mellea, and more yellow than L. sierrae. In California, it may be the

Sticta is a genus of lichens in the family Peltigeraceae. The genus has a widespread distribution, especially in tropical areas, and includes about 114 species. These lichens have a leafy appearance, and are colored brown or black. Sticta species with cyanobacteria as photobionts can fix nitrogen from the atmosphere, and due to their relative abundance and high turnover, they contribute appreciably to the rainforest ecosystem. They are commonly called spotted felt lichens.

Diploschistes scruposus (crater lichen) is a pale gray to white, warty to cracked (areolate) crustose lichen with black, urn-shaped (urceolate) fruiting bodies (apothecia). It is found worldwide on growing on rock (saxicolous) that is siliceous, in open areas in Mediterranean, temperate and polar areas, from the low tropics to high altitudes. It is in the family Graphidaceae. In California, it is the most common member of the Diploschistes genus. It is not covered in a powdery white coating (epruinose), which distinguishes it from other members of the genus. In Nepal, Diploschistes scruposus

Cornicularia is a genus of lichenised ascomycetes in the large family Parmeliaceae. It is a monotypic genus, with a single currently accepted species, the saxicolous lichen Cornicularia normoerica, and is sometimes referred to as the bootstrap lichen. The lichen forms small, dark tufts rarely exceeding 2 cm in height that are anchored so firmly to rocks, with narrow, stiff branches topped by shiny black reproductive discs. It grows on high-elevation, sun-exposed rocks and boulders, where its compact, shrub-like appearance and glossy black-brown surface make it distinctive among mountain

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