NEEDS to BE EDITED
ANDERS TO TATYANA - it is such a wide distribution that I do not consider EN appropriate, then there should be less than 125 genetically unique mycelia in the world (we tentatively estimate that each mycelia represent two mature individuals). The number of unrecorded location must be significant within such a large area. I suggest either NT using the C-criteria (less than 15000 mature .
individuals), that will be a more safe assessment. When encountered, how many trees are typically colonised per site? Other ways perhaps NT and A2c…possibly also 3c…if we can argue that appropriate habitat has declined within this large are with >30% during the last 50 yrs (and A3…if it is projected to continue the coming 50 years.
Taxus baccata is Least concern and said to increase (IUCN global red-list) - it may still be declining in the areas you refer to.
Bondarcevomyces taxi is a conspicuous wood-inhabiting dark-orange rare polypore growing on coarse dead wood of Taxus baccata and Chamaecyparis formosensis (EN) in old-growth forest. It is widespread but apparently very rare as it has been muched searched and only rarely encountered Known from from Russia (Karsnodar Kray, Adygeya Republic, Siberia, Russian Far East) China and Taiwan. It has only been recorded in a few sites (1-2 in the regions above) and usually with only one fruitbody per tree and site.
Therefore this species is assessed as Near Threatened C2a because of small population and its appropriate habitats of odlgrowth forests with Taxus baccata and Chamaecyparis formosensis is declining.
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)
Bondarcevomyces taxi is a very rare transeurasian temperate polypore occured in relict plant communities and characterized by disjunctive areal. It has very typical appearance with stable characteristic features: dark-orange velvety cap, chrome-yellow to olive yellow tubes, basidiome blackening under KOH, inhabiting mostly on the stumps of Taxus baccata, Chamaecyparis formosensis. At the moment its known from Russia (Karsnodar Kray, Adygeya Republic, Siberia, Russian Far East, China, and Taiwan. This species is can be assessed as Endangered C2a (i) because of a few known localities in the world and globally declining of habitats with Taxus baccata and Chamaecyparis formosensis.
Bondarcevomyces taxi known from Russia, China and Taiwan, with a records from Western Caucasus, the the southern parts of far East of Russia, in northeastern China (Jilin Prov.) and Ilan Prov. of Taiwan.
It was found in 5 regions of Russia: Western Caucasus (Krasnodar Kray, Adygeya Republic), Southern Siberia (Salair) and Far East (Khabarovsk Kray and Primorsky Kray). 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.). 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 (http://maks-portal.ru/obshchestvo/video/chrezvychaynaya-situaciya-obyavlena-v-tiso-samshitovoy-roshche-ona-mertva-na-70) . Another locality is situated in unprotected area of Adygea Rep. and is vulnerable too. Plant communities with Taxus baccata are declining in Caucasus and this process is expected to continue in the next 50 years, followed by the decline of the species. Besides Chamaecyparis formoensis, another host of B.taxi in China now is also under threat of habitat loss, and it’s estimated as EN (https://en.wikipedia.org/wiki/Chamaecyparis_formosensis)
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 highly specialized wood-inhabiting fungus that causes brown heart rot (Parmasto, 1999) mostly of Taxus baccata and Chamaecyparis formoensis. 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 as well as single finds on Larix gmelinii (= L. dahurica). and Pinus koraiensis in Siberia and Far East. There is not enough data on its ecology. Presumably it is a saprotrophus but perhaps colonizes living trees and continues to degrade wood after the tree death. Specific set of colonized trees may be an evidence of the high specialization to woody substrate. The known collections have been found mainly in protected areas of old-growth forests, so it can be supposed that this species tends to old forests.
DO YOU HAVE DATA OF HOW MANY TREES/STUMPS THAT APPEAR TO BE COLONISED PER LOCALITY?
The main threat for the Caucasian subpopulation is the rapid declining of wild Taxus due to weak competitive ability in the changing enviroment, as well as intensive development of human activity (recreation, building, cutting down of Taxus tree for souvenirs, etc.). Also at the moment there is a strong threat of destroying Caucasian localities because of epiphytoty of Buxus colchica which forms plant communities together with Taxus baccata. Another host of B. taxi Chamaecyparis formoensis now is also under threat of habitat loss (see population trends above).
All natural communities with Taxus baccata and Chamaecyparis formosensis should be protected.
Detailed information of biology, ecology and distribution of this very rare species is needed. Data on genetics of individual and population size in different parts of the world would be very useful.
There is no any data on practical use of this species
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.
Red Data Book of Krasnodar Kray: Plants and fungi. III edition. / Edited by S.A.Litvinskaya - Krasnodar: Adm. of Krasnodar Kray, 2017. - 850 p. (In Russian)
Red Data Book of Republic of Adygeya. Rare and threatened representatives of the regional fauna and flora. Part 1. Introduction. Vegetabilia and Mycota. - The second edition. Maykop: Kachestvo, 2012. 340 p. (In Russian)
Flora, vegetation and mycobiota of the reserve “Ussuriysky”/ Z.M. Azbukina et al. - Vladivostok: Dalnauka, 2006. 300 p.(In Russian)
Plants, fungi and lichens of the Sikhote-Alin Reserve / the team of authors/ ed. E.A. Pimenova - Vladivostok: Dalnauka, 2016. - 557 p.
Zhang, D & Christian, T. 2013. Chamaecyparis formosensis. The IUCN Red List of Threatened Species 2013: e. Downloaded on 28 February 2018.