R-L categories correct, but text here does not match final assessment. Developed and updated version published at IUCN´s Red List update, July 18th 2019.
Buchwaldoboletus lignicola is a rare wood-inhabiting bolete associated with Phaeolus schweinitzii as a mycoparasite or a saprotroph at the same substrate. It’s is reported from 26 countries of Europe, Russia, Turkey, China and USA. In most countries it’s considered as a rare or very rare species, in 9 countries is redlisted with a category Cr, En, Vu, NT with declining. Rather strict range of ecological requirements of this species and dependence on presence of two hosts determinate the necessity of protection at the global level.
Preliminary assessment: There are 330 records in approx. 120 localities globally, the total population is expected < 1200, the estimated number of mature individuals approx. 12000. The most appropriate could be category NT under criterion C1
Boletus lignicola Kallenb.
Gyrodon lignicola (Kallenb.) Heinem.
Phlebopus lignicola (Kallenb.) M.M. Moser
Pulveroboletus lignicola (Kallenb.) E.A. Dick & Snell
Xerocomus lignicola (Kallenb.) Singer
Buchwaldoboletus lignicola is a Holarctic species widespread in Eurasia and North America. It’s found in 26 countries, but almost overall it’s considered as a rare.
It is considered as a rare or a very rare species in most countries and redlisted in 9 of them as Cr, En, Vu, NT. Usually a few findings per country are registered in their databases, except UK (54). General trends of existence are not entirely clear, however the specific requirements of this species to a host make it threatened and needed to be protected.
In total about 330 finds were recorded in the world with majority in Europe (about 290), but also in USA (~ 20), Russia, Africa, China (less then 20 in sum). However the number of known localities is much less (map of GBIF and publications): approx. 110 in Eurasia, 10 in USA, so 120 in sum and total population is expected < 1200. Since only fruitbody is usually found per locality, the number of mature individuals is estimated approx. 12000. The length of evaluation period used for these estimates (50 years = three generations). The most appropriate Criterion C1, NT.
Population Trend: Uncertain
This is xylotrophic fungus with a complicative life strategy. Usually it grows on the rotten wood of Pinacea trees (Pinus sylvestris, P. pinaster, P.strobus, P. nigra, Larix decidua, Pseudotsuga menziesii, Picea abies) previously colonized by another rare fungus, Phaeolus
schweinitzii (Fr.) Pat., a brown-rot fungus, which leads to the death of the host plant and then continuing to grow on the stump as saprotroph (Kuthan & Sedivy 1971). Sometimes it was also found just to be saprotrophic whithout any neghbourhood of other fungi. The species is known mostly from warm southern or temperate regions, but also a few records are from the northern regions with a mild oceanic climate (Funga Nordica, 2012).
The main threat is deforestation of coniferous forests, including clearing of old stumps. Also grassroot fires can lead to destroying of habitat and destruction of hosts.
Its edibility is unknown.
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Ainsworth, A.M., Smith, J.H., Boddy, L., Dentinger, B.T.M., Jordan, M., Parfitt, D., Rogers, H.J. & Skeates, S.J. (2013). Red List of Fungi for Great Britain: Boletaceae. A pilot conservation assessment based on national database records, fruit body morphology and DNA barcoding. Species Status 14 JNCC Peterborough. http://jncc.defra.gov.uk/page-6497
GBIF https://www.gbif.org/occurrence/search?offset=0&q=Buchwaldoboletus lignicola