• 1Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Cyttaria exigua Gamundí

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Scientific name
Cyttaria exigua
Common names
IUCN Specialist Group
Cup-fungi, Truffles and Allies
Assessment status
Proposed by
Giuliana Furci
Melissa Mardones Hidalgo
Anders Dahlberg, Giuliana Furci, Melissa Mardones Hidalgo
Comments etc.
Thomas Læssøe, David Minter

Assessment Notes

Taxonomic notes

Cyttaria exigua Gamundí, Darwiniana 16(3-4): 495 (1971)

Why suggested for a Global Red List Assessment?

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.

Geographic range

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.

Population and Trends

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

Habitat and Ecology

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.

Logging & wood harvestingNamed species

Conservation Actions

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.

Research needed

Use and Trade


CALVELO, S. & GAMUNDÍ, I.J., Hickenia 3(4): 13–14 (1999).
GAMUNDÍ, I.J., Darwiniana 16 (3–4): 461–510 (1971).
Gamundí, I. J.; Minter, D. W. 2004. Cyttaria exigua. [Descriptions of Fungi and Bacteria]. IMI Descriptions of Fungi and Bacteria, 2004, 160, pp Sheet 1594
GAMUNDÍ, I.J., MINTER, D.W., ROMERO, A.I., BARRERA, V.A., GIAIOTTI, A.L., MESSUTI, M.-I. & STECCONI, M. 2004. Checklist of the Discomycetes (Fungi) of Patagonia, Tierra del Fuego and adjacent antarctic areas. Darwiniana.
INGOLD, T., Mycologist 2(1): 3 (1988).
KORF, R.P., Australian Journal of Botany Supplementary Series 10: 77–87 (1983).
Peterson, K.R; Pfister. D.H. 2010. Phylogeny of Cyttaria inferred from nuclear and mitochondrial sequence and morphological data. Mycologia, 102(6): 1398–1416.

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted