• Proposed
  • Under Assessment
  • NTPreliminary Assessed
  • 4Assessed
  • 5Published

Tricholoma joachimii Bon & A. Riva

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Scientific name
Tricholoma joachimii
Bon & A. Riva
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Preliminary Assessed
Preliminary Category
NT A2c+A3c+A4c, C1+C2a(i)
Proposed by
Tommy Knutsson
Tommy Knutsson
Anders Dahlberg, Claudia Perini, Elena Zvyagina
Comments etc.
Reda Irsenaite, Michael Krikorev

Assessment Status Notes

Preliminary globally assessed as: NT A2c+A3c+A4c, C1+C2a(i)

Taxonomic notes

Reports of Tricholoma joachimii in USA (Oregon) needs to be revised whether it belongs to same taxon as European material. It is not considered as the same taxon as in Europe here.

Why suggested for a Global Red List Assessment?

Tricholoma joachimii is a rare mycorrhiza-species growing with Pinus. The species seems confined to more or less base-rich, semi-open, xerothermic forests on sandy soils. Few known localities, small population, heavily fragmented and confined to a rare habitat threatened by forestry.

Preliminary globally assessed as: NT A2c+A3c+A4c, C1+C2a(i)

Geographic range

Rare and scattered in South-Central Europe with some isolated populations in northern Europe (Sweden, Norway). The findings in USA (Oregon) as well as findings in some parts of Europe (with different ecology; Pinus pinaster, acid soil) needs to be revised wether belonging to same taxon.

Population and Trends

Currently know from less than 50 localities in 11 countries. The real number may be 10x higher and are cautially estimated to 500-1.000 inferring maximum 10.000-20.000 individuals. The habitat requirement, i.e. oldgrowth semiopen Pinus forests, is under threat from forestry and densification with spruce. Small subpopulations and heavily fragmented. The species are probably decreasing with more than 15% (maybe even as high as 30%) in 3 generations (50y).

Population Trend:

Habitat and Ecology

Tricholoma joachimii is a mycorrhiza-species growing with Pinus spp. The species seems confined to more or less base-rich, semi-open or xerothermic forests on sandy soils. Probably adapted to semi-opened mixed forests that once where common and used for extensive grazing.

Boreal ForestTemperate Forest


The main threat to the species is forestry, and esp. the clearcut methods that are widely used today. Also replacement of semi-open mixed forest types with more dense and uniform Picea-dominated forests is negative. In part of its range the species is probably also loosing habitats due to suppression in fire frequency which results in more homogenic forest eco-systems.

Small-holder grazing, ranching or farmingUnintentional effects: large scale (species being assessed is not the target) [harvest]Suppression in fire frequency/intensity

Conservation Actions

In Sweden there is an Action plan for the species (Johansson & Bohus-Jensen 2010). So far its resulted in an increase in knowledge but very few new localities found. All in all only known from 10 localities and about 100 carpophores seen. The actions suggested is mainly focused on area protection and restoration of habitats incl. shrub removal and reintroduction of cattle to graze the forests.

Site/area protectionResource & habitat protectionSite/area managementHabitat & natural process restorationEducation & awareness

Research needed

Use and Trade


Bohus-Jensen, E. Artfaktablad Tricholoma joachimii. Link: http://www.artfakta.se/artfaktablad/Tricholoma_Joachimii_2072.pdf
Johansson, P. & Bohus-Jensen, E. 2011. Åtgärdsprogram för sienamusseron, Tricholoma joachimii 2011-2015 . Link: http://www.lansstyrelsen.se/gotland/SiteCollectionDocuments/Sv/Publikationer/Natur-och-miljö/Hotade-arter/sienamusseron-2011-2015.pdf
Redlist of Slovak fungi. Link: http://www.wsl.ch/eccf/Slovakia.pdf

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted