The species is declining on a global scale due to decreasing areal of virgin or old growth spruce and fir forests and a poor ability to spread and establish in forest after clearcutting. It is redlisted in five European countries. (This proposal and the main information belongs to Dr.Ivan Zmitrovich, Komarov Botanical Institute, Saint-Peterburg)
The boreal and mountain parts of Europe, Caucasus, Asia, North America.
In Russia it’s known in 11 regions. European part: Lenigradskaya, Arkhangelskaya, Tverskaya oblasts; Krasnodar Kray, Republics Karelia and Karachaevo-Cherkesia; Ural: Perm Kray, Sverdlovskaya oblasts, Republic Komi; Siberia: Tomskaya and Tumenskaya Oblasts; Far East: Kamchatka
The species exclusively occurs in boreal and mountain old-growth forests of spruce (Picea abies, P. obovata, P. glauca, P. engelmannii, P. pungens) and fir (Abies alba, A. concolor, A. nordmanniana, A. lasiocarpa) with the majority of the European localities known from Finland, Poland, Czech Republic, Montenegro, Georgia, Ukraine, Russia. Forests where it occurs are primarily threatened by clearcutting.
The species seems to have poor ability to spread and establish in forest after clearcutting. The fungus is gravitating to moist conditions of old forests with abundance of huge overmossed fallen logs on various stages of decaying, therefore, it absent in wide range of exploiting forest enterprises.
There are about 50 known localities in Russia: European part ~ 22, Ural ~ 23; Siberia: ~3; Far East: ~2 (Khermansson Ya., 1997, Kosolapov D.A., 2008, Mukhin V.A., 2008;Stavishenko, 2002 , 2006, Ruokolainen A., Manninen O. 2014., Red Data Book…., 2013; database of Komarov Botanical Institute)
Evaluation period 50 years = 3 generations (according to the recommendation of Dahlberg & Mueller, 2011)
Criterion C2a can be appropriate
Population Trend: Uncertain
This is xylosaprotroph which causes brown rot of presumably coniferous wood. As substrata were mentioned Picea abies, P. obovata, P. glauca, P. engelmannii, P. pungens, Abies alba, A. concolor, A. nordmanniana, A. lasiocarpa, Larix sp., Pinus sp., Pseudotsuga sp., Tsuga sp., rarely deciduous trees, viz. Populus tremuloides, P. trichocarpa, Alnus sp.
The fruitbodies appears on large decorticated trunks in their central parts, as a rule on log underside. On the logs closely attached to the ground, the fruitbodies form on the lateral or even the upper sides, then consisting of ruff-like nodules. Most often the they emerge from fissures or crefts in the trunk, or from under the bark at the edge of decorticated wood.
The habitats of this fungus are relief depressions which are well-drained throghout the growing season, housing temporary rivers during the spring, and a thick, long-lasting snow cover in the winter.
The vegetation on these slopes is most lurixant and consisted by productive spruce or fir, intermixed with aspen and some other deciduous trees and having regular gaps enriched by fallen logs of various decay stages.
The American authors repeatedly report that the species grows near the receding snowline, or during the winter and spring on snow-covered trees. In Europe the growth period was registered beginning in early autumn.
Forests where it occurs are primarily threatened by clearcutting.
Setting aside spruce and fir forest reserves where the species have good populations. At these forests, natural or prescribed burning should be considered to maintain desired forest dynamics. The removing of fallen logs in served areas should be prohibited.
Dahlberg A & Croneborg H. 2003. 33 threatened fungi in Europe. Complementary and revised information on candidates for listing in Appendix I of the Bern Convention T-PVS (2001) 34 rev 2.
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Niemelä T. 1980. On Fennoscandian polypores 7. The genus Pycnoporellus. Karstenia 20: 1-15.
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Ruokolainen A., Manninen O. 2014. Aphyllophoroid fungi of Zaonezhye Peninsula. Biogeography, landscapes, ecosystems and species of Zaonezhye Peninsula, in Lake Onega, Russian Karelia. Reports of the Finnish Environment Institute. Vol. 40. Helsinki. P. 221-244.
Stavishenko I.V. Rare species of xylotrophic fungi of Vishersky Reserve // Modern Mycology in Russia: Abstracts of 1 congress of mycologists of Russia. Moscow, 2002. C.98-99. (In Russian)