• Proposed
  • Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 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
Under Assessment
Proposed by
Alina Greslebin
Comments etc.
Anders Dahlberg, Alina Greslebin

Assessment Notes

Taxonomic notes

Corticioid species is macroscopically characterized by its orbicular to effuse basidiome, whitish to cream coloured with a pinkish tint; growing exclusively on bark of living Saxegothaea conspicua.  Microscopically 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

Temperate forests (Valdivian forests) of Argentina y Chile.

Population and Trends

Population Trend: unknown. Possibly decreasing associated to the decrease of it host population by forest fragmentation and fires.

Population Trend: Uncertain

Habitat and Ecology

Growing on bark of living Saxegothaea conspicua.

Temperate Forest


The host, Saxegothaea conspicua is restricted in distribution and confined to national parks in Argentina. 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.
Unintentional effects: subsistence/small scale (species being assessed is not the target) [harvest]
Human intrusions & disturbance
Increase in fire frequency/intensity

Tourism & recreation areasUnintentional effects: subsistence/small scale (species being assessed is not the target) [harvest]Recreational activitiesIncrease in fire frequency/intensity

Conservation Actions

Protection of habitat and host species.

Resource & habitat protection

Research needed

Population size, distribution & trends

Population size, distribution & trends

Use and Trade


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