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Description type:Latin diagnosis 
Description:
Russula acrifolia Romagn. (basionym)?Doc. Mycol. 26 (104): 32. 1997.
? Russula acrifolia Romagn.?(nom. inval., art. 37.1 ICBN)?Bull. mens. Soc. linn. Lyon 31 (6): 173. 1962.
? Russula acrifolia Romagn.?(nom. inval., art. 32.1 (c) ICBN)?Russules d'Europe Afr. Nord: 203-204. 1967.
Original diagnosis
R. acrifolia (= R. densifolia sensu J. Schaef. = adusta var. rubens Romagn.) - Pileo 5-15 cm lato, globoso, dein e convexo plano, depresso, margine obtusa, involuta, dein interdum sinuosa, ex umbrino brunneo, viscoso. Stipite 3-6,5 x 1,2-3 cm, firmo, cylindrato, pleno vel medulloso-cavo, albo, dein rubido vel fuliginoso colore tincto. Carne crassa, rubescente, dein fuliginea. Sapore acri vel acerrima, praesertim in lamellis. Lamellis satis stipatis vel satis distantibus, inaequalibus, saepe furcatis, 5-12 mm latis, falciformibus, saepe paulum arcuatis, decurrentibus, pallide eburneis, deinde cremeis, ex ochraceis vel paulum glaucis cremeis, in senectute brunnescentibus. Sporis in pulvere albis. - Sporis (6,5)-7-9,5-(11,5) x (5,5)-6,5-7,5 µ, dense reticulatis, verrucis modicis. Basidiis 45-55 x 7-10-(11,5) µ. Cystidiis cylindratis vel subfusiformibus, 57-115 x 5-7,2 µ, appendiculatis, ope Sulfovanillinae nigricantibus. Epicute pilis gracilibus, obtusis, 3-4,5 µ latis, cum aliquot dermatocystidiis angustis (3,5-5 µ), obtusis vel appendiculatis. Laticiferis in cortice stipitis praesentibus. - Frequens in silvis, sub arboribus frondosis vel coniferis.
Typification: Holotypus: Romagnesi 55-164 (PC)
Europe: France: Ermenonville
 
Taxon name: