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Nomenclature

Russula gossypina Buyck
Kew Bull. 54 (3): 669. 1999.

Original diagnosis

Basidiomata epigea. Pileus 94 mm diam., leviter irregularis dein centro depressus, pellis haud viscosa in centro laevis marginem versus fissurans vel grosse squamulosa carne gossypina exhibiente, brunneo-grisea (5E3-5) margo prompte pallidiora ac grosse striata haud tuberculosa. Lamellae 11 mm latae adnatae cremeae distantes lamellullis irregulariter mixtae; acies concolor integra. Stipes 41 x 12 mm, basim versus usque ad 16 mm, leviter excentricus haud radicans albus plenus. Caro centro 7-8 mm crassa, marginem versus valde attenuata tactu rufescens dein brunneo-grisea haud nigra. Odor ingrata. Sapor mitis dein acris ope FeSO4 insensibilis. Latex nullus. Sporae in cumulo pallidae probabiliter albae.
Sporae minutae, ellipsoideae vel larmiformes, 5.6-5.98-6.6 x 4.2-4.82-5.3 µm (Q = 1.17-1.24-1.35, n = 20); verrucis isolatis obtusis ornatae; macula suprahilaris verruculosa inamyloidea vel leviter amyloidea. Basidia 42-56 x 6-7 µm, clavulata tetraspora. Cystidia numerosa, 54-87 x 5-6.5 µm, subcylindrica obtusa saepe sinuosa tenuitunicata, metachromatica in azureo cresylico, contentu granulosa vel fibrillosa-refringente repleta. Cellulae marginales pellis extremitatibus similantes sed parviorae. Mediostratum cellulis sphaericis latis compositum. Pileipellis pseudoparenchymatica, vix caro delineata, paulum gelatinosa sed omnes hypharum cellulae vaginis mucosis azureo cresylico plus minusve metachromaticis inclusae, nonnullae pigmento brunneo repletae; dermatocystidia 3-7 (10) µm diam., numerosa teniutunicata contentu granulosa vel fibrillosa repleta.
Holotypus: Madagascar: Mandraka, sub Uapaca densifolia, 3 feb. 1997, Buyck, Eyssartier & Moreau 97.246 (PC).

Typification

Holotypus: Buyck & al. 97-246 (PC)
Africa: Madagascar: Mandraka
Leaf litter under Uapaca densifolia

Description

Photographs

Microscopy

SEM photos