Basionym: Polyporus taxi Bondartsev, Bot. Materialy Otdela Sporovykh Rastenii,V (1-3): 17 (1940);
Syn.: Hapalopilus taxi (Bondartsev) Bondartsev et Singer, Ann. Mycol. 39: 52 (1941);
Parmastomyces taxi (Bondartsev) Dai et Niemelä, Ann. Bot. Fennici 32: 222 (1995);
Tyromyces taxi (Bondartsev) Ryvarden et Gilb., Europ. Polypores, Pt. 2: 693 (1994)
This is a rare transeurasian temperate species occured in relict plant communities and characterized by disjunctive area.
Extends from Western Caucasus to Russian Far East (sothern part), northeastern China (Jilin Prov.) and Ilan Prov. of Taiwan. It have not been found in Europe so far. In total this species is known from 10 localities.
It was found in 5 regions of Russia: Western Caucasus (Krasnodar Prov. (kray), Adygea Republic), Southern Siberia (Salair) and Far East (Khabarovsk Prov. and Primorsky Prov.). In Russia 8 finds are known today. In China it was found in Jilin Prov. (Changbai Co., Changbai Forest Reserve) and in Taivan (Ilan Co.). According to Dahlberg and Mueller (2011), the category EN C 2a (i) may be applied (global population size appr. 2000 mature individuals, global population is divided into appr. 8 small subpopulations).
In Caucasus this species was found in relict plant communities with Taxus baccata. The type locality (yew-box groove in Khosta river canyon) is under threat of destroying because of epiphytoty of Buxus colchica and recreation press. Another locality is located in unprotected area of Adygea Rep. and is vulnerable also. Plant communities with Taxus baccata decline in Caucasus and this process is expected to continue in the next 50 years, followed by the decline of the species.
The rest specimens was found in reserves (excl. Salair (Siberia) and Taiwan?) on Larix gmelinii, Larix sp. and Pinus koraiensis.
Population Trend: Deteriorating
It is a wood-inhabiting fungus caused brown heart rot (Parmasto, 1999). B. taxi was registered for the first time on a stump of Taxus baccata in the Black Sea region of Caucasus. Then it was found on Chamaecyparis formosensis, Larix gmelinii (= L. dahurica), Larix sp. and Pinus koraiensis in Siberia and Far East. There are not enough data about its ecology. Presumably it is a saprotroph but perhaps colonizes living trees and continuing degradation after the tree has died. Specific set of colonized trees may be an evidence of the high specialization to woody substrate. There are not data about the age of trees colonized by this fungus. However, as the specimens were found mainly in protected areas we may suppose that the this fungus tends to old forests.
The main threat for the Caucasian subpopulation is the rapid decline of yew due to intensive development of human activity (recreation, building, cutting down of yew for souvenirs, etc.). But the threats for the subpopulations of Far East are less apprehensible because the areas of Larix gmelinii and Pinus koraiensis cover all Eastern Siberia and Far East and do not decline so significantly.
In Caucasus all plant communities with yew should be protected.
We have got a little information about the ecology and distribution of this distinct and very rare species. We should сoncentrate efforts on the search of new localities and studying of its ecology.
Bondartsev A. S. Polypores of European part of Russia and Caucasus. - Moscow, Acad. Press, 1953. - 1106 p. (In Russian)
Vassilieva L. N. Fungi of Caucasian Reserve. - Uchenye Zapiski Kazanskogo universiteta. Otdelnyi ottisk. - Kazan,1939. - Vol. 99 (1). - 66 p. (In Russian)
Parmasto E. Bondarcevomyces, a new genus of polypores (Hymenomycetes, Basidiomycota) // Mycotaxon. – 1999. – Vol. 70. – P. 219-225.