Ionomidotis irregularis is a temperate - boreal saprophytic ascomycete that habits trunks of a deciduous trees species eg. Alnus incana, Betula spp., Populus spp., Carpinus betulus and Fagus sylvatica. The species grows in old-growth forests, virgin forests and forests with natural forest succession. It is a rare species restricted to localities with humid microclimate with wet dead wood and with immediate presence of a brook or ravine. Known localities are very fragmented.
The species is easily identified by it´s quite large and irregular cup-like densly punctate ascocarps on dead wood. It is also easy to identify microscopically: lanceolate parafyses, with acute apex.
The species is estimated to be in decline due to intensive forest management. It is listed in red data book of Estonia as Vulnerable (VU) and in Finland as Endangered (EN).
In Europe the species is very rare in with approx. 50 (-60) known localities and an estimated total numner of localities approx 500 corresponding to about 5000 individuals. The habitat of old and virgin forests of Ionomidotis irregularis is presently facing and expected to continue to have a more than 30% decline in quality and quantity, due to intensive forestry and land-use/deforestation. The decline of the major habitat of the species, old-growth forest and virgin forests, in the evaluation period (30 years; Dahlberg and Mueller 2011) it is estimated to be in the magnitude of >30%. The decline of the species is estimated to be the same magnitude. For these reasons I. irregularis is assessed to meet the category Vulnerable (VU ) under the A-criteria (A2c+3c+4c) and the C-cruteria C2a(i)
We treat this species here as a European taxon. There is a strong DNA-evidence that the species in Europe is different to the species in the USA (closely related species).
Irja Saar: data from UNITE: https://unite.ut.ee/bl_forw_sh.php?sh_name=SH1610846.08FU#fndtn-panel1
A rare european species, mostly in quite rich old-growth forests and virgin forests, which are declining.
Ionomidotis irregularis is a temperate - boreal saprophytic ascomycete. It is known at the time from 11 European countries: Austria, Czechia, Estonia, Finland, Hungary, Norway, Poland, Russia, Slovakia, Spain and Switzerland.
Ionomidotis irregularis is known from approx. 50- (60) localities in Europe from 11 countries: Estonia (22), Czechia (1), Slovakia (4), Switzerland (1), Norway (1), Finland (2), Austria (4), Hungary (1), Spain (3) and Russian Federation (approx.9) according to data from species database maps and information from mycologist of many European countries, the estimated population size is approx. 500 localities. Assuming two ocurences per sites this corresponds to approx. 5 000 individuals. The species is known from many European countries, but only very few localities in each country.
Relate decline to published data/assessments? infer the rate.
The decline of the major habitat of the species, old-growth forest and virgin forests, in the evaluation period (last 30 years) (Dahlberg and Mueller 2011) it is estimated to be in the magnitude of >30%. The decline of the species is estimated to be the same magnitude. Based on this, the species becomes red-listed as VU according to the A-criterion (A2c + 3c + 4c) (species/habitat decline >30 %) and ongoing decline together with the estimated population size of 5000 individuals also the C-criterion (C2a(i).
Population Trend: Decreasing
Ionomidotis irregularis is a temperate - boreal saprophytic ascomycete that habits strongly decayed mossy trunks of a deciduous trees species eg. Alnus spp. Betula spp., Ulmus glabra, Populus spp., Carpinus betulus and Fagus sylvatica. The species grows in old-growth forests, virgin forests and forests with natural forest succession. in the immediate presence of a brook, brook-side habitats.
Ionomidotis irregularis and its habitats (old-growth forests/virgin forests) have been declining eg. due to intensive forestry as well as decreased habitat quality/ecological conditions (decrease of dead wood) due to modern forestry with clear-cuttings. In Finland these forests are redlisted as EN (mesic - herb-rich coniferous forests) and old mixt forets dominated with decidous trees as VU.
Add some general for the oerall dstribution
Protection of the old forests with decidous trees, leaving dead wood to the forests. Logging/harvesting forbidden near brooksides/ravins.
Běťák J., Pärtel K., Kříž M. (2012): Ionomidotis irregularis (Ascomycota, Helotiales)
v České republice s poznámkami k jeho rozšíření a ekologii v Evropě. – Czech
Mycol. 64(1): 79–92.
von Bonsdorff T., Kytövuori I., Vauras J., Huhtinen S., Halme P., Rämä T., Kosonen L. & Jakobsson S. 2014: Sienet ja metsien luontoarvot. — Norrlinia 27: 1–272. (Fungi of the forests with high conservation value in Finland – indicator species).
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