A very rare mycorrhiza-species with broad-leaved trees (Quercus, Carpinus et al.) confined to calcareous, semi-open, xerothermic forests. Less than 100 known localities in Europe and confined to a rare habitat and a typical species indicating “hot-spots” in forest ecosystems allways occurring together with many other rare and threatened fungi as well as other species.
The species is mainly threatened by deforestation and other changes of land-use, i.e. clear-cutting, replacement of mosaic forests into monoculture of similar-aged stands, abandonment of extensiv grazing and other small-scale disturbances resulting in semi-open, heterogenic woodlands. The scale of this habitat loss in ara and quality is expected to be 15-30% in a 50y timespan incl both past, present and future.
So far mainly known from Western Palearctic with scattered records from South-Central Europe, southern parts of Scandinavia east to Stavropol region (Caucasus).
Sweden (6 localities), Austria (1), Germany (27), Denmark (2), Russia (4), France (x), Italy (x).
In Russia it’s supposed 4 (х10) = 40 localities. Since C.odoratus associates with Fagus and Quercus, and these types of communities constantly and evidently decrease because of natural and antropogenic reasons (i.e. area of oak forests - about 20% since 1966), we can suppose past and future declining of species. In Russia C. odoratus is recommended to the federal Red Data Book. At present it included in RDB of Penza Oblast. (Tatanya Svetasheva).
Sum No. of globally known localities: less than 100 known incl. unknown (x5) certainly less than 500 localities expected.
No. of individuals: probably less than 5.000 but definitely less than 10.000
Habitat loss: past and ongoing >15% (50y)
Suggestion: NT C2a(i) and close to VU on A-criteria.
Evaluation based on small global population (<10.000 individuals), habitat decline in area and quality and small no. of individuals in each subpopulation. You could also argue that the occurences getting more and more fragmented.
Population Trend: Deteriorating
Mycorrhiza fungus growing with deciduous trees (mainly Quercus, Carpinus, Fagus) in continental areas with favourable local climate (warm) on calcareous and shallow soils (e.g. leptosol). These semi-open natural habitats have been going thru severe transformations last 100y being either 1) Clearcut of original forest and transformed to other habitats (i.e. more productive forests of single tree species and/or to more uniform forest structures with less variation) or 2) being abandoned from earlier traditional landuse such as extensive grazing, pollarding and selective small-scale tree-felling resulting in a densification and change in forest structure detrimental to the species.
These semi-open natural habitats have been going thru severe transformations last 100y being either 1) Clear-cutting, replacement of mosaic forest types into monoculture of similar-aged stands (i.e. more productive forests of single tree species and/or to more uniform forest structures with less variation) or 2) being abandoned from earlier traditional landuse such as extensive grazing, pollarding and selective small-scale tree-felling resulting in a densification and change in forest structure detrimental to the species.
In Sweden there is an Action plan for the species (Knutsson 2014). So far its resulted in a great increase in knowledge about ecology, habitats and managment of sites but only very few observations of the species where made. The actions suggested is mainly focused on area/site protection from logging and restoration of habitats incl. shrub removal, selective tree-felling and reintroduction of cattle to graze the semi-open natural forests.
Bohlin, K. & Knutsson, T. 2001. Cortinarius odoratus. http://www.artfakta.se/artfaktablad/Cortinarius_Odoratus_1987.pdf.
Knutsson, T. 2009. Åtgärdsprogram för svampar i kalkrika ädellövbärande fodermarker. Naturvårdsberket. Link: http://www.naturvardsverket.se/Nerladdningssida/?fileType=pdf&pid=3549&downloadUrl;=/Documents/publikationer/978-91-620-5950-7.pdf
Knutsson, T. 2014. Svampar i kalkrika ädellövmarker på Öland. Länsstyrelsen Kalmar. Link: http://www.lansstyrelsen.se/kalmar/SiteCollectionDocuments/Sv/publikationer/Rapporter/2014/rapp1404svampar_kalkrika_adellovmarker_webb.pdf