Slo.: rjavi bledotrosnik - Habitat: modestly southeast inclined mountain slope, mixed forest, Fagus sylvatica and Picea abies dominant; overgrown slope scree, rocks and boulders, skeletal sandy calcareous ground, relatively warm place, partly protected from direct rain by tree canopies, average precipitations ~ 3.000 mm/year, average temperature 7-9 deg C, elevation 570 m (1.870 feet), alpine hytogeographical region. - Substratum: forest soil under Fagus sylvatica. - Place: Lower Trenta valley, between villages Soa and Trenta, below 'Na melu' place, East Julian Alps, Posoje, Slovenia EC. - Comments: Gyroporus castaneus is an all over the world spread species, however, it is quite rare almost everywhere. It is usually found under Quercus sp. but occasionally appears also under other broadleaf trees including Fagus sylvatica. - Two pilei growing together; pileus dimension of the larger one 7.5x6 cm and diameter of the smaller one 4.5 cm; flesh firm and brittle, pores 2-3/mm; stipe of the larger fruit body 5 cm tall, hollow, split into two, brittle; taste mild, mushroomy, smell none; no discoloring when injured or bruised; trama white, very slowly discoloring to pale ochre-brown on the edges; SP faint, pale ocher, oac715 (questionable estimate). - Hypha septa with clamps. Spores smooth. Dimensions: 8 [9.5 ; 10.1] 11.5 x 5 [5.8 ; 6] 6.8 microns; Q = 1.4 [1.6 ; 1.7] 1.9; N = 39; C = 95%; Me = 9.8 x 5.9 microns; Qe = 1.7. Basidia clavate. Dimensions: 24.3 [29.5 ; 32.6] 37.9 x 9.2 [11.5 ; 12.8] 15.1 microns:; Q = 2 [2.4 ; 2.7] 3.2; N = 19; C = 95%; Me = 31.1 x 12.1 microns; Qe = 2.6. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil (spores); NEA 40x/0.65, magnification 400x (hypha, basidia), in water. AmScope MA500 digital camera. - Herbarium: Mycotheca and lichen herbarium (LJU-Li) of Slovenian Forestry Institute, Vena pot 2, Ljubljana, Index Herbariorum LJF - Ref.: (1) Id'ed by Mr.Bojan Rot, www.gobenabovskem.com (2) G. Kibby, British Boletes, Copyright Geoffrey Kibby (2011), p 22. (3) J. Breitenbach, F. Kraenzlin, Eds., Fungi of Switzerland, Vol.3. Verlag Mykologia (2000), p 68. (4) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Wrttembergs, Band 2., Ulmer (2000), p 256. (5) R. M. Dhncke, 1200 Pilze in Farbfotos, AT Verlag (2009), p 22. (6) S. Buczacki, Collins Fungi Guide, Collins (2012), p 418.
