B. Papp szerk.: Studia Botanica Hungarica 33. 2002 (Budapest, 2002)

Vasas, Gizella: Interesting macrofungi in Hungary, IV. Three rare Russula species (Basidiomycetes, Russulales)

pH 3.7-4.3 than on soils with pH 4.5-6.5. Its mass occurrence was observed in Scots pine wood (with Vaccinium) of excellent water supply. Occurrence of this species in Hungary was really surprising. Also its relationship with Quercus was discovered for the first time. It was found in an oak wood (with Luzula) in Sopronhorpács in July 1993, and in a beech forest of damp, acidic soil in the Mátra Mts (near Mátraháza) in August 2001. This species being very rare in Hungary is regarded as critically endangered species in the proposed Red List (RIMÓCZI et al. 1999). Its taxonomic position at section level is argued. MARCHAND (1977) suggested to place it into Section Décolorantes, since the colour of the spore powder and the pigment of the cap-skin of R. paludosa are the same as those of the other species of this group. In opinion of SINGER (1975) only the specimens with small and pale cap are likely to be mistaken for species of Section Décolorantes, entirely developed specimens are clearly different. However, the flesh of species of Section Décolorantes turns grey, later black, while that of R. paludosa remains unchanged. Unfortunately, some illustrations in SCHAEFFER'S (1952) monograph may result in misunderstandings, since the stem of R. paludosa is painted grey, the same grey as those of R. vinosa and R. chloroflava belonging to Section Décolorantes shown on the same table. However, in the case of R. decolorans no grey colour is seen. Cap: 6-15 (20) cm in diam., at first convex, later expanded and finally depressed at the centre. Its surface sometimes rough, in older specimens the margin might be slightly sulcate. Cap-skin can be easily peeled off up to the centre, glutinous viscid when damp, glistening when dry. Its colour bright red, blood red, orange red, might be flecked with cream-ochre with age. GUIs: somewhat brittle, crowded, adnate or free, with numerous intermingled gills. It is creamy, dirty white when young, and turns to cream ochre later. Its edge often reddish at the cap margin. Stem: 6-18 cm tall, 1-4 cm wide, solid, fleshy, cylindrical or clavate. Exceptionally pure white, flecked with pale rose. Flesh: solid, turning soft with age. Its taste is mild, its scent uncharacteristic or somewhat like fruits. Herbarium specimens (BP): Sopronhorpács, in Querceto. Leg., det.: Cs. Locsmándi and G. Vasas, 10.07.1993. - Mátra Mts: Mátraháza, in Fageto. Leg., det.: Cs. Locsmándi and G. Vasas, 01.08.2001. Russula cicatricata Romagnesi 1967 ex Bon 1987 This species prefers siliceous areas, and mainly grows under oak and birch trees (ROMAGNESI 1967, MARCHAND 1977). EINHELLINGER (1985) reported it from peaty, acidic soil, under birch and poplar trees from the surroundings of Munich. KRIEGLSTEINER (2001) found it in sunny, light, mixed deciduous forest on