- Proposed
- Under Assessment
- Preliminary Assessed
- Assessed
- VUPublished
Arrhenia discorosea (Pilát) E.A. Zvyagina, A.V. Alexandrova, T.M. Bulyonkova
- Scientific name
- Arrhenia discorosea
- Author
- (Pilát) E.A. Zvyagina, A.V. Alexandrova, T.M. Bulyonkova
- Common names
Аррения розоводисковая
kalichovka fialovoružová
kalichovka lužní- IUCN Specialist Group
Mushroom, Bracket and Puffball- Kingdom
- Fungi
- Phylum
- Basidiomycota
- Class
- Agaricomycetes
- Order
- Agaricales
- Family
- Tricholomataceae
- Assessment status
- Published
- Assessment date
- 2019-03-26
- IUCN Red List Category
- VU
- IUCN Red List Criteria
- C2a(i)
- Assessors
- Krisai-Greilhuber, I.
- Reviewers
- Svetasheva, T., Dahlberg, A. & Iršėnaitė, R.
Assessment Notes
Justification
Arrhenia discorosea is a small but distinct wood-inhabiting saprotrophic fungus with red brown colour and pinkish red lamellae. It is mainly confined to coarse trunks of aspen and poplar, more rarely growing on Fraxinus, Ulmus or Tilia. This species depend on moist and decayed wood and is mostly known from riparian natural forests. The total number of localities is estimated to be less than 1000 and the total population size not to exceed 10 000 mature individuals Old-growth alluvial forest habitats with coarse dead wood have dramatically declined worldwide during the last century. In Europe, almost all original riparian and wetland forests are estimated to be lost. The habitat decline is ongoing and suspected to continue into the future. Therefore,Arrhenia discorosea is assessed as Vulnerable.
Geographic range
Arrhenia discorosea is a holarctic species present in Europe, Asia and North America.Population and Trends
Arrhenia discorosea is a widespread but very rare species due to its habitat specialisation. Globally about 100 localities are known (GBIF and various databases). It is known from one site in Belgium and in Poland. Known occurrences Russian Federation (50), Austria (11), Belgium (1), Bulgaria (1), Czech Republic (2), Germany (6), France (12), Georgia (1), Canada (1), Mongolia (1), Poland (1), and Slovakia (1). The total number of localities is estimated to be less than 1000. We conservatively estimate the number of fungal genotypes per site to be 5. The total population size is estimated as 10,000 mature individuals (cf Dahlberg and Mueller 2011). Old-growth alluvial forest habitats with coarse dead wood have dramatically declined worldwide during the last century. In Germany it is estimated that only 0.7 % of the original riparian and wetland forest is remaining (230.00 of initially 4 million ha, Welle et al. 2018). The situation is similar in other European countries, e.g. in Austria. Floodplain forest is the most threatened forest type in Europe and is classified as Endangered in the European Red List of habitats (Janssen et al. 2016). The habitat decline is ongoing and suspected to continue into the future.
Population Trend: decreasing
Habitat and Ecology
Arrhenia discorosea is a wood inhabiting saprotrophic fungus found on decaying, sometimes standing trunks of aspen or poplar (Populus), but also other tree species such as Fraxinus, Ulmus and Tilia. The species is a typical representative of the floodplain forest. It also occurs in old-growth deciduous forests and in dark conifer forests mixed with aspen on trunks in final decay stage..Threats
Threats to Arrhenia discorosea are caused by habitat destruction and decline due to draining of riparian forests and clear-felling of trees (cf. Hughes et al. 2012). It is negatively affected by removal of coarse woody debris.
