• Proposed
  • Under Assessment
  • Preliminary Assessed
  • LCAssessed
  • 5Published

Amanita caesarea (Scop.) Pers.

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Scientific name
Amanita caesarea
Author
(Scop.) Pers.
Common names
Caesar's Amanita
Amanite des Césars
Oronge
muchomurka císarka
Kaiserling
Veza e Çezarit
Благва
muchomor cesarski
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Agaricales
Family
Amanitaceae
Assessment status
Assessed
Preliminary Category
LC
Proposed by
Clemence Pillard
Assessors
Susana C. Gonçalves
Comments etc.
Nirmal Harsh, Izabela L. Kalucka, Tetiana Kryvomaz, Nikola Lačković, Clemence Pillard
Reviewers
Anders Dahlberg

Assessment Status Notes

A to SU: Looks great March 23rd.

Susana to Anders: I’ve revised and re-written some sections for clarity (I hope). Most important: in case you don’t agree with my edits- For Population and Trends 2018-03-02 16:13:49 - it is your revised version with minor typos corrected. For Justification 2018-03-01 11:59:12 - it is your revised version with minor typos corrected.


//Su March 2nd 2018

Assessment Status Notes:
Criterium A failed - uncertain current population/habitat trends (many habitats, many hosts); past decline only reported in Europe and not in all countries;
Criterium B failed - the estimated extent of occurrence (EOO) far exceeds IUCN thresholds for any category of threat;
Criterium C failed - reported from more than 500 sites in Europe and the total number, including yet unrecorded sites, is estimated to be at least a 10-fold higher;
Criterium D failed - The total number of mature individuals is projected by large to exceed 10 000.

Justification

Amanita caesarea is a common, widespread, and well-known edible ectomycorrhizal mushroom typically associating with oaks and other hardwood species in a variety of habitats from the Mediterranean and the Black Sea basins. Although red-listed in many European countries, A. caesarea doesn’t meet any of the criteria for a threatened category on a global scale. It has a large distribution and host breadth and there is no evidence of large-scale population decline. It can be locally very abundant where suitable habitat exists. Therefore, it is assessed as Least Concern (LC).


Taxonomic notes


Why suggested for a Global Red List Assessment?

With a bright orange cap and yellow stem, provided with a ring and a volva, Amanita caesarea is an unmistakable fungus. It is a common and widespread edible ectomycorrhizal species from the Mediterranean and the Black Sea basins but has been declining for the last decades in some countries of occurrence and threats to its habitat (mostly related to forestry and airborne nitrogen deposition) have been identified. It is nationally red-listed in many European countries (Albania, Austria, Bulgaria, Czech Republic, France (regional RedList), Germany, Hungary, Montenegro, Poland, Russia (regional RedList), Serbia, Slovakia, Switzerland and Ukraine and protected by law in some (Croatia, Czech Republic, Germany, Serbia, Slovakia, Slovenia and Ukraine).


Geographic range

The species has its native distribution range around the Mediterranean and the Black Sea basins. It is known from northern Africa (Algeria, Morroco, Tunisia), the southern part of Europe (absent from The Netherlands, Poland, UK and Scandinavia), the Caucasus region (Georgia, Turkey), Ukraine, Crimea and the Russian Caucasus, mostly Krasnodar Kray (Svetasheva, personal communication). Contrary to some reports, a comprehensive study by Sánchez-Ramírez et al. (2015) showed that the species does not occur in North or Central America nor in East Asia.


Population and Trends

Amanita caesarea has been reported from more than 500 sites in Europe (2015) and the total number, including yet unrecorded sites, is estimated to be at least a 10-fold higher. In Europe, reported population trends diverge: while the species is nationally red-listed in many countries of occurrence based on population decline (e.g. Austria, Switzerland, Bulgaria), some countries reported stable populations (e.g. France, Greece), and Romania and Belgium reported increases (Fraiture & Otto 2015). Population size and trends in northern Africa, Turkey and the Caucasus are unknown. In brief, there is no evidence of population decline on a global scale. The species can be locally abundant where suitable habitat exists. The total number of mature individuals is projected by large to exceed 10 000.

Population Trend: Uncertain


Habitat and Ecology

Amanita caesarea is ectomycorrhizal with trees in the Fagaceae, typically Quercus (Q. cerris, frainetto, gussonei, petraea, pubescens, robur, suber, ilex, rotundifolia), but also Carpinus, Fagus and Castanea. Outside the Fagaceae, it is reported to associate with Corylus (Spain), Tilia (Serbia), Abies borisii-regis and A. cephalonica (Greece) and Pinus sylvestris (Germany). It can be found in a variety of habitats, mainly in deciduous to sclerophyllous forests dominated by Quercus, but also other hardwood forests. Mixed forests (Picea in Romania, Pinus in, e.g., Italy), dehesas (Spain), montados (Portugal), macchia and heaths, both in Italy, as well as extensively managed grasslands with solitary trees (Slovenia) are also suitable habitats. Lowlands to lower mountain regions, only seldom above 1200 m (Italy). In Europe, the species occurs in the following Natura 2000 habitats (codes): 4030, 6310, 9110, 9130, 9150, 9160, 9170, 91F0, 91G0, 91H0, 91I0, 91L0, 91M0, 91W0, 91AA, 9230, 9240, 9260, 9270, 9280, 9330, 9340.

Temperate ForestMediterranean-type Shrubby VegetationTemperate Grassland

Threats

Identified threats in Europe mostly relate to forestry (e.g. increased fertilization) and airborne nitrogen deposition. Irresponsible picking has also been reported (Fraiture & Otto 2015).


Conservation Actions

In Europe, many populations are located within the Natura 2000 network of sites and hence are thought to be protected. The species is nationally red-listed in Albania, Austria, Bulgaria, Czech Republic, France (regional RedList), Germany, Hungary, Montenegro, Poland, Russia (regional RedList), Serbia, Slovakia, Switzerland and Ukraine, and protected by law in some (Croatia, Czech Republic, Germany, Serbia, Slovakia, Slovenia and Ukraine).


Research needed

Population size, distribution & trendsHarvest level trendsTrade trendsHabitat trends

Use and Trade

One of the most sought-after edible mushrooms in the Mediterranean. Commercially harvested.

Food - human

Bibliography

Dahlberg, A. & Mueller, G. 2011. Applying IUCN red-listing criteria for assessing and reporting on the conservation status of fungal species. Fungal Ecology 4:147-162.

Fraiture A. & Otto P. (eds) 2015. Distribution, ecology and status of 51 macromycetes in Europe. Results of the ECCF Mapping Programme. Scripta Botanica Belgica 53, Botanic Garden Meise.

Fraiture, A. & Walleyn, R. 2005. Distributiones Fungorum Belgii et Luxemburgi Fasc. 3. Scripta Botanica Belgica 38:1-79.

Gvritishvili, M.N., Hayova, V.P., Krivomaz, T.I. & Minter, D.W. 2007. Electronic Distribution Maps of Georgian Fungi. http://www.cybertruffle.org.uk/gruzmaps [website, version 1.10].

Lange, L. 1974. The distribution of Macromycetes in Europe. A report of a survey undertaken by the Committee for Mapping of Macromycetes in Europe. First half century.

Maire, J.-C., Moreau, P.-A. & Robich, G. 2009. Compléments à la Flore des Champignons Supérieurs du Maroc de G. Malençon et R. Bertault. Ed. CEMM. Nice.

Malençon, G., & Bertault, R. 1975. Flore des champignons superieurs du Maroc. Tome 2. Trav. Inst. sci. cherifien Fac. Sci. Rabat, Sér. bot Biol. vég. 33.

Pantidou, M.E. 1980. Macrofungi in forests of Abies cephalonica in Greece. Nova Hedwigia 32: 709-723.

Persoon, C.H. 1801. Amanita caesarea. Synopsis Methodica Fungorum 2: 252.

Sánchez-Ramírez, S., Tulloss, R.E., Amalfi, M. & Moncalvo, J.-M. 2015. Palaeotropical origins, boreotropical distribution and increased rates of diversification in a clade of edible ectomycorrhizal mushrooms (Amanita section Caesareae). Journal of Biogeography 42, 351–363.

Sesli, E. & Denchev, C.M. 2009. Checklists of the myxomycetes, larger ascomycetes, and larger basidiomycetes in Turkey. Mycotaxon 106: 65-68.


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted