- Proposed
- Under Assessment
- Preliminary Assessed
- Assessed
- VUPublished
Paraxerula caussei (Maire) R.H. Petersen
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- Scientific name
- Paraxerula caussei
- Author
- (Maire) R.H. Petersen
- Common names
Grauhaariger Wurzelrübling
slizečka černá- IUCN Specialist Group
Mushroom, Bracket and Puffball- Kingdom
- Fungi
- Phylum
- Basidiomycota
- Class
- Agaricomycetes
- Order
- Agaricales
- Family
- Physalacriaceae
- Assessment status
- Published
- Assessment date
- 2019-03-26
- IUCN Red List Category
- VU
- IUCN Red List Criteria
- C2a(i)
- Assessors
- Krisai-Greilhuber, I.
- Reviewers
- Mueller, G.M.
Assessment Notes
The content on this page is fetched from The IUCN Red List of Threatened Species: https://www.iucnredlist.org/species/147537697/148154512
Justification
Paraxerula caussei is a medium sized thinfleshed gilled mushroom with a tomentose blackish grey cap and a long radicant stipe. It is a meso-thermophilic saprotrophic species growing on dead Fagus-roots, mainly in climax beech forest over limestone. It is a European species present from the submediterranean to the temperate zone and recorded from throughout Europe except for northern areas. It is included in Red Lists of nine countries. Based on GBIF and databases available (see references) 234 localities are estimated worldwide. The number of mature individuals has been estimated at 1400 with a number of mature individuals in each subpopulation of less than 250. The habitat types Mullbraunerde-beech forest, mesophil limestone beech forest, and thermophile limestone beech forest are endangered biotope types in Austria (Essl and Egger 2010).The species is assessed as VU C2a(i) based on its quite small population size, fragmentation, loss of habitat and a diminishing habitat quality.
Taxonomic notes
Paraxerula is the current name (Petersen and Hughes 2010).Geographic range
This is a European species distributed in the submediterranean to temperate zones, recorded from South and South-East, West-, Central and southern North Europe.Population and Trends
Mature individuals are rare. Based on GBIF and databases available (see references) there are 234 estimated localities worldwide. The number of mature individuals has been estimated at 1400 following Dahlberg and Mueller (2010). Localities are widely dispersed and not strongly fragmented.
Population Trend: decreasing
Habitat and Ecology
It is a meso-thermophilic saprotroph growing on dead Fagus-roots in calcareous beech forests. It is primarily restricted to climax beech forest over limestone with shallow base-saturated clay soil, or on immature “Kalkbraunerde” or Malmlimestone.Threats
It is endangered by fertilizer input, surface acidification, biotope destruction (logging) and biotope alteration (conversion of beech forests into coniferous and other forests) and land use development, e.g., for recreation.Conservation Actions
Reduction of fertilizer inflow via water and air from adjacent agriculture is needed, as is habitat protection. Halting conversion of Fagus dominated forests into conifer plantations.Further investigation of population size, population trends and habitat requirements is needed.
