Cyttaria exigua Gamundí, Darwiniana 16(3-4): 495 (1971)
This parasitic fungus on Nothofagus trees only known from Argentina, and recently two sightings in Chile, in Tierra del Fuego.
Preliminary red-list assessment: probably LC (Least Concern), possibly or possibly DD (Data Deficient).
Parasitic on several species of Nothofagus. Probably largely under recorded. Severe lack of data. Also unclear if the taxonomy is settled. No apparent threats.
Nothofagus forests in Chile (Magallanes, Puyehue in Región de Los Lagos and Antártica Chilena) and Argentina (Neuquén, Río Negro, Tierra del Fuego), on the island of Tierra del Fuego. Highest recorded altitude: 790 m.
This species is much less conspicuous than other members of the genus and tends to be overlooked. There are eighteen records from Argentina since November 1965 and up to 2004.
No information about its population size available.
Population Trend: Uncertain
A highly evolved and highly specific obligate parasite only on branches of Nothofagus spp. This fungus does not cause wood decay. Found on Nothofagus dombeyi Mirb. (Oerst.), N. pumilio (Poepp. & Endl.) Krasser and N. betuloides (Mirb.) Oerst.
Restricted distribution and obligated parasite.
Regarding its hosts, no clear risk has been reported. Nothofagus dombeyi was classified as Least Concern according to UICN criteria. N. pumilio and N. betuloides have not yet been assessed for the UICN Red List. However, it is known that N. pumilio is used in furniture, shingles and construction and is under a forest management program.
There is no published evidence that the fungus shortens the life of the tree or seriously affects its vigour, but severely infected individual branches may be killed. Similarly there seem to be no published reports about attempts to control the fungus.
Based on the number of records so far, the lack of information regarding population size and generation time and the fact that its hosts are not endangered species, the species was classified as Least Concern according to the UICN criteria.
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