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

Tricholomopsis sulphureoides (Peck) Singer

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Scientific name
Tricholomopsis sulphureoides
(Peck) Singer
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Under Assessment
Proposed by
Irja Saar
Irja Saar
Comments etc.
Anders Dahlberg

Assessment Notes

Taxonomic notes

Synonym: Tricholomopsis osiliensis Vauras

Morphologically similar taxa are T. badinensis Holec, Kolařík & Kunca (found only from Slovakia) and North American T. flavescens (Peck) Singer (see Saar & Voitk 2015).

Why suggested for a Global Red List Assessment?

Species with sulphur to lemon yellow fruitbodies, with smooth to fibrillose cap; growing on Picea abies or Abies alba trunks in natural to old-growth coniferous/ mixed forests. It has small number of localities in the temperate and boreal zones of eastern North America and Europe.

Geographic range

Growing on temperate and boreal zones of eastern and western North America (Canada, USA) and Europe (France, Estonia, Poland, Slovakia, Spain, UK).

Population and Trends

There are 113 occurrences in Gbif.org (63 USA, 18 Canada, 22 Estonia, 3 UK, 1 Spain, 1 France, 2 Slovakia) and one sequenced specimen from China (UNITE). Observations from Norway (1) and Russia Moscow region (Holec et al. 2019).
Mature individuals ca 230, estimated population size 2-3-fold higher, up to 700 mature individuals. Estimated decline of population size due to habitat and substrate loss during 2 generations (20 years) is 20%.
Preliminary assessment: VU C1, D1

Population Trend:

Habitat and Ecology

Species is saprobic on Picea and Abies trunks, found only from natural, old-growth or virgin forests rich in dead wood.

Boreal ForestTemperate Forest


Decrease of the area of natural, old-growth and virgin spruce/ fir forests, also amount of available substrate is decreasing (Picea/ Abies fallen trunks with diameter of more than 20 cm).

Unintentional effects: large scale (species being assessed is not the target) [harvest]

Conservation Actions

Retaining fallen spruce/ fir trunks in older commercial forests.

Site/area protectionResource & habitat protection

Research needed

Population size, distribution & trends

Use and Trade

Not known as edible.


Holec J, Kunca V, Kolařík M. 2019. Tricholomopsis badinensis sp. nov. and T. sulphureoides—two rare fungi of European old-growth forests. Mycological Progress 18: 321-334.
Saar I, Voitk A. 2015. Type studies of two Tricholomopsis species described by Peck. Mycological Progress 14(7): 46.
Tricholomopsis sulphureoides (Peck) Singer in GBIF Secretariat (2019). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2020-02-12.
UNITE: Tricholomopsis sulphureoides (Peck) Singer | SH1177849.08FU. Available at: https://unite.ut.ee/bl_forw_sh.php?sh_name=SH1177849.08FU#fndtn-panel1

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted