• Proposed
  • Under Assessment
  • Preliminary Assessed
  • VUAssessed
  • 5Published

Uncobasidium roseocremeum Gorjón, Gresl. & Rajchenb.

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Scientific name
Uncobasidium roseocremeum
Gorjón, Gresl. & Rajchenb.
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Preliminary Category
Proposed by
Alina Greslebin
Alina Greslebin, Francisco Kuhar, Donald Pfister, Camille Truong
Sergio Pérez Gorjón
Comments etc.
Anders Dahlberg, James Westrip
Gregory Mueller

Assessment Notes


This species occurs in the Valdivian forest of Argentina and Chile, and is restricted to forest with Saxegothaea conspicua. The species is suspected to be in decline, but there is not strong evidence for this. Overall the population size is estimated to be small (500-900 mature individuals), but could potentially be larger. Precautionarily, this species is listed as Vulnerable under criterion D1.

Taxonomic notes

Corticioid species characterized by its orbicular to effuse basidiome that are whitish to cream coloured with a pinkish tint; growing exclusively on bark of living Saxegothaea conspicua.  Microscopically it is characterized by its large bisterigmate basidia with lateral protuberances, paraphysoid encrusted hyphae, and globose basidiospores.

Why suggested for a Global Red List Assessment?

Uncobasidium roseocremeum is a rare corticioid fungi living on bark of Saxegothaea conspicua only known from the temperate Valdivian forests of Argentina and Chile, therefore it has a restricted distribution. Their only host is a near threatened species. Even reported as “quite frequent” on this substrate the number of records is low, indicating that it is not a common species. 
The ongoing decline of its host tree of in combination with its fragmentation and rareness, results in it being assessed as Vulnerable (VU) under the criteria for B1 y B2a y b.

Geographic range

This species occurs in temperate forests (Valdivian forests) of Argentina and Chile. It is restricted to forest with Saxegothaea conspicua.

Population and Trends

The species’ host is in decline due to forest fragmentation and fires, and this species is suspected to be decreasing in line with the decrease of it’s host population. The species is severely fragmented within its range, potentially found in small clusters of <10 mature individuals. Assuming that the number of sites where this species may occur in the wider habitat could be up to 5-10 times more than the number of known sites, the total population size of this species is estimated to be between 500-900 mature individuals.

Population Trend: Decreasing

Habitat and Ecology

This species grows on the bark of living Saxegothaea conspicua trees.

Temperate Forest


The host, Saxegothaea conspicua, is restricted in distribution and confined to national parks in Argentina, where it can be impacted by tourism activities and fire events. In Chile conversion of native forest in the coastal Cordillera to commercial plantations of Pinus radiata and Eucalyptus means that much of the habitat for this species has been lost and continues to disappear.

Tourism & recreation areasAgro-industry plantationsRecreational activitiesIncrease in fire frequency/intensity

Conservation Actions

Some subpopulations are known from protected areas. Protection of habitat and the host species is vitally important for this species. Raising awareness of this species and its host, in order to reduce the impacts of tourism activities, could be beneficial.

Resource & habitat protectionAwareness & communications

Research needed

Research into the population size, distribution and trends of this species would be beneficial, in particular investigating whether it may occur in more coastal areas of Chile, because at the moment it is only known from Andean parts of the Valdivian forest.

Population size, distribution & trends

Use and Trade

There is no use/trade of this species.


Gorjón S.P., Greslebin A.G., Rajchenberg M. 2012. Uncobasidium roseocremeum sp. nov. and other corticioid basidiomycetes from the Patagonian Andes of Argentina. Mycotaxon 121:349–364.

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted