Image of Leccinellum griseum (Quél.) Bresinsky & Manfr. Binder 2003

Description:

Slo.: gabrov bed - ; Synonymy: Boletus griseus (Qul.) Sacc. & D. Sacc., Gyroporus griseus Qul., Leccinum griseum (Qul.) Singer., Leccinum carpini (R. Schulz) M.M. Moser ex D.A. Reid ?, Leccinellum pseudoscabrum (Kallenb.) Mikk ? - Habitat: predominantly hard wood, broadleaf tree forest; moderately inclined mountain slope, southwest inclination; cretaceous clastic rock (flysh) bedrock, partly protected from direct rain by tree canopies; average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 460 m (1.500 feet), alpine phytogeographical region. Substratum: soil. Comments: Members of genus Leccinum/Leccinellum are relatively easy to recognize by distinct stem squamules. However, their taxonomy is a problem and species determination is often difficult. No definite and generally accepted answers are known. In 1995 the genus Leccinum comprised about 36 species distinguished by their macro-characters. Ten years later, in 2005, only 14 were still recognized based on DNA analysis (Kibby 2011). It has been proven that some traditional traits, which seemed once very important (for example flesh color changes when cut) have little significance. A new genus Leccinellum was established based on characteristics of hypha in hut cuticle. Yet not all mycologists agree with this approach. Such situation reflects in the fact that in Index Fungorum (IF) current name of this observation is probably Leccinellum griseum, while MycoBank still keeps with the current name Leccinum griseum. There are several ambiguities about species names and I am not sure I handled them correctly. Be that as it may this species doesn't look too appealing for photography, particularly not when old (as on these photos). But it is quite common in Slovenia and edible, and of very good taste (when younger). In this observation it was growing solitary. Spores smooth. Dimensions: (15,1) 15,3 - 16,7 (17,4) (5,2) 5,3 - 5,9 (6,3) m; Q = (2,4) 2,7 - 3,1 (3,2); N = 10; Me = 15,9 5,6 m; Qe = 2,8. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil; in water, fresh material. AmScope MA500 digital camera. Ref.: (1) Personal communication with Mr. Bojan Rot, www.gobenabovskem.si. (2) G. Kibby, British Boletes, Copyright Geoffrey Kibby (2011), p 56. (3) http://www.mycodb.fr/fiche.php?genre=Leccinellum&espece=griseum m (accessed March 6. 2018) (4) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Wrttembergs, Band 2, Ulmer (2000), p 275. (5) J. Breitenbach, F. Kraenzlin, Eds., Fungi of Switzerland, Vol.3. Verlag Mykologia (1991), p 70.