Dag Olav Øvstedal

Protopannaria campbellensis is a rare species of lichen in the family Pannariaceae. It is found in the southern New Zealand shelf islands. It is unique due to its specific structure and lack of lichen products, which are typically found in related species. The lichen is found in wet grasslands and upland peat bogs.

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Massalongia griseolobulata is a species of lichen in the family Massalongiaceae. Found in the Tristan da Cunha–Gough Island, it was described as a new species in 2010 by Norwegian lichenologist Dag Øvstedal. The type specimen was collected from the lower slopes of Tafelkop on Gough Island). Here it was found growing on the trunk of a treefern (Lomariocycas palmiformis) at an altitude of 270 m (890 ft). The species is known only from the type locality. The lichen has a pale grey to ochre, squamulose (scaley) thallus covering an area of 2–3 cm (0.8–1.2 in). Its ascospores, which number eight

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Gyalidea goughensis is a species of crustose lichen in the family Gomphillaceae. Found in the Tristan da Cunha–Gough Island, it was described as a new species in 2010 by Norwegian lichenologist Dag Øvstedal. The type specimen was collected from the inland of The Admirals (a small satellite island east of Gough Island). Here it was found growing on the stem of an Island Cape myrtle (Phylica arborea) tree at an altitude of 100 m (330 ft). The species is known only from the type locality. The lichen has a thin, green-grey crust-like thallus that grows in bark fissures. Its ascospores, which

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Gyalideopsis heardensis is a species of crustose lichen in the family Gomphillaceae. This inconspicuous lichen forms thin, grey to grey-green crusts on rotting vegetation and is distinguished by its unusually large, strongly multi-celled spores contained singly within each spore sac. It is endemic to the remote subantarctic Heard Island, where it grows in the island's harsh, cold, and extremely wet climate.

Gyalideopsis heardensis is a species of crustose lichen in the family Gomphillaceae. This inconspicuous lichen forms thin, grey to grey-green crusts on rotting vegetation and is distinguished by its unusually large, strongly multi-celled spores contained singly within each spore sac. It is endemic to the remote subantarctic Heard Island, where it grows in the island's harsh, cold, and extremely wet climate.

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Caloplaca megalariicola is a species of lichenicolous (lichen-dwelling) lichen in the family Teloschistaceae. Found on the Falkland Islands, it was described as a new species in 2012 by Alan Fryday. It grows on the lichen Megalaria grossa.

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Psoroma absconditum is a species of squamulose (scaly) lichen in the family Pannariaceae. It forms small patches of pale brown scales up to 2 cm across, often with distinctive brown disc-shaped fruiting bodies that can reach 4 mm in diameter. The lichen is known only from remote subantarctic islands in the southern Indian Ocean, where it grows among moss cushions in cold, windy conditions.

Mycobilimbia subbyssoidea is a species of crustose lichen in the family Ramalinaceae. This small lichen forms thin, greyish patches with tiny black fruiting bodies up to 1 mm across. It was found growing among dying moss on Heard Island, a remote and largely ice-covered island in the southern Indian Ocean, and remains known only from the original discovery site.

Lepraria goughensis is a little-known species of leprose lichen in the family Stereocaulaceae. It is only known to occur on Gough Island in the south Atlantic Ocean.

Lepraria brasiliensis is a species of dust lichen in the family Stereocaulaceae. Found in Brazil, it was formally described as a new species in 2010 by John Elix, Adriano Spielmann, and Dag Øvstedal. It has a thin, greyish-green leprose (powdery) thallus up to 10 cm (4 in) wide that grows on bark. The holotype was collected in April 2006 from Caraça Natural Park (Parque Natural do Caraça) in Catas Altas, Minas Gerais, Brazil. The specimen, designated as Spielmann, Canez & Marcelli 2345, was found growing on the trunk of a Eucalyptus tree in open forest at 1,265 m (4,150 ft) elevation. The

Echinoplaca pernambucensis is a species of crustose lichen in the family Gomphillaceae. It was described as new to science in 2011. It is found in the Atlantic Forest in Pernambuco, Brazil. This lichen is similar in appearance to Echinoplaca verrucifera, but lacks setae and contains gyrophoric, lecanoric, and subgyrophoric acids.

Bouvetiella is a monotypic genus of lichenized fungus in the class Lecanoromycetes. It contains only the species Bouvetiella pallida.

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Usnea austrocampestris is a species of beard lichen in the family Parmeliaceae. Found on the Falkland Islands, it was originally described as a new species by the lichenologist Dag Øvstedal in 2012. This mountain-dwelling lichen is in the section Neuropogon of the genus Usnea.

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Micarea phylicae is a species of crustose lichen in the family Ectolechiaceae. Found in the Tristan da Cunha–Gough Island, it was described as a new species in 2010 by Dag Øvstedal, as Szczawinskia phylicae. The type specimen was collected during the Norwegian Tristan da Cunha expedition of 1937–1938. Captain Erling Christophersen and botanical assistant Yngvar Mejland found the specimen above Sandy Point in Tristan da Cunha, where it was growing on Island Cape myrtle (Phylica arborea) at an altitude of 300 m (980 ft). The species was reclassified in the genus Micarea in 2026.

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Parmelia lambii is a species of foliose lichen in the family Parmeliaceae. It is found in the Antarctic Peninsula. The species was originally described in 1915 from a specimen collected on Jenny Island, but was later recognized as belonging to the genus Parmelia rather than Physcia and given a new name in 2009. This small, dark brown lichen forms narrow leaf-like lobes with tiny white spots and is covered in small wart-like growths, but has only been found in its non-reproductive state.

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