B. Papp szerk.: Studia Botanica Hungarica 39. 2008 (Budapest, 2008)

Vasas, G.: Interesting macrofungi in Hungary VII. Boletopsis leucomelaena

(2000) this is due to environmental problems, i.e. increasing air pollution, incorrect forest management, and eutrophisation of the upper soil layers. A comprehensive study by HROUDA (2005b) on the genera and species of the family Bankeraceae recorded 64 collections of Boletopsis leucomelaena surveyed in various herbaria in Austria, the Czech Republic, Germany, and Poland; additional data of occurrence were also recorded from Denmark, Finland, Norway, Russia, and Sweden. MARCHAND (1976) characterised Boletopsis leucomelaena as a very rare species and mentioned tecords from Estonia, France, Germany, Russia, and Switzerland. A reference to its rare occurrence in North America (California) is found in ARORA (1986). An analysis by KRIEGLSTEINER (2000) states that Boletopsis leucomelaena is a rare Holarctic species having a wide, but highly fragmented distribution and a very sporadic pattern of occurrence from submeridional to boreal areas. Its full range includes northetn Asia (Siberia), North America (USA and Canada), the Canary Islands, North Africa (Morocco, Algeria), and Europe. One occurrence in Japan is noted by ARORA (1986). Spruce forests growing on calcareous bedrock are generally mentioned as habitats of Boletopsis leucomelaena, although JÜLICH (1984) made reference to deciduous forests as a rare possibility of occurrence (but without specifying the tree species). According to MARCHAND (1976), Bourdot and Galzin have recorded the species from Castanetum. In light of the above, the significance of findings in Hungary of Boletopsis leucomelaena is the unusual habitat type, where the species was found. Contrary to previous records in the literature (calcareous spruce forests as its generally known habitats) in our country, the species was found in acidic beech forest environment, so far on three occasions. DESCRIPTION Cap: 4-15(-20) cm wide, at first convex, later depressed at the centte; circular in outline to somewhat ittegulat, lobate, margin incurved, wavy; surface dry, smooth to fibrinöse or breaking up into small scales, specially at centre; colour variable: olive-, bluishor brownish-grey to brownish or black, darker where handled. Hymenophore: Pore fine, 1-2 per mm, mostly angular, whitish to greyish, turning grey-brown when dry. Tube 2-5 mm long, somewhat decurrent, not readily separable from the cap context. Stem: 2-8 cm long, 1-3 cm thick, solid, central or eccentric, equal or with a narrowed base; surface coloured like the cap: grey to olive-brown, smooth to squamulose, the base slightly pointed. Flesh: In cap 0.5-2.5 cm thick; white to grey, tinged pink-violet; greenish-grey when dry. Taste slightly bittet, odour mild to fragrant. Spores: 4.7-7 x 4-5 urn, almost round to subglobose, with a nodulose surface, non-amyloid; colourless to slightly brownish. Spore print: White to pale brown. Herbarium specimens: Visegrád Mts: Szentendre, Luzulo nemorosae-Fagetum sylvaticae, leg.: V. Erdei, 24.10.1998 (AL 98/83), det.: L. Albert. - Visegrád Mts: Tahi,