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 Add this item to the list   804168 Original description
   
Remarks (public):The combination of macro- and micromorphological characters suggest that Russula sikkimensis belongs in subsect. Griseinae J. Schaeffer (sect. Heterophyllae, subgenus Heterophyllidia) (Sarnari 1998). The species can be easily recognized by the combination of the parrot green (b: 30E8) non striate pileus, white stipe, context yellowing but never turning bright orange with FeSO4, cream spore print, subreticulate basidiospores with weakly amyloid ornamentations and pileipellis with numerous bottle-shaped elongate terminal cells (with hyphal 3-6 µm wide ends) and single celled (nonseptate) pileocystidia. 
Description type:Original description 
Description:Pileus 55-85 mm diam., convex to planoconvex with broadly depressed centre. Pileipellis smooth, never glutinous, never striate or sulcate, parrot green (b: 30E8) with dark green (b: 29F8) centre, sometimes paler to olive towards margin. Lamellae adnexed, close (8-9/cm at pileus margin), many forked towards the juncture of stipe, yellowish white, unchanging when bruised, lamellulae absent. Stipe 55-75 × 17-21 mm, cylindrical with tapering base, white (b: 1A1) to chalky, changing yellowish when bruised, solid. Context white (b: 3A2) when young, turning to pale yellow (a: 4A3) with maturity, unchanging after bruising, turning orange white (a: 5A2) with FeSO4, leaf green (a: 59) with guaiac and unchanging with KOH. Taste slightly acrid to mild (at maturity). Spore print yellowish white to cream. Basidiospores 7.2-7.7-8.7 × 6.2-6.9-7.8 µm (Q = 1.03-1.12-1.21), globose to broadly ellipsoid; ornamentation weakly amyloid, composed of very low ridges and warts that are mostly lower than 0.9 µm and forming an irregular, interrupted to partially complete or rarely complete reticulum; suprahilar plage indistinct, not amyloid. Basidia 40-54 × 7.5-10 µm, slender, mostly subclavate (never clavate), 4-spored; sterigmata short, 3-5 × 1.5-2.5 µm. Subhymenium 25-35 µm thick, cellular. Pleuromacrocystidia 64-110 × 9.5-13.5 µm, not abundant, fusiform to lanceolate with capitate, moniliform or appendiculate apex, emergent up to 35 µm, content dense. Lamellar edge fertile with basidia, cheilomacrocystidia and marginal cells. Cheilomacrocystidia 48-58 × 7-9 µm, not abundant, fusiform, sometimes with capitate apex, emergent up to 26 µm, content dense. Marginal cells fusiform to narrowly clavate. Lamellar trama composed of nested sphaerocytes surrounded by connective hyphae. Pileipellis thick, up to 180 µm, cutis to trichoderm, composed of branched septate extremities of bottle shaped to elongate hyphae and pileocystidia; hyphal ends 3-6 µm, wide, fusoid to cylindrical, thin walled; pileocystidia 18-70 × 6-8 µm, unicellular, narrowly clavate to clavate, rarely subclavate or even slightly fusiform, content dense. Stipitipellis up to 50 µm thick, mostly a cutis, composed of cylindrical to subclavate hyphal ends (up to 6 µm broad) and caulocystidia measuring 35-60 × 6-8 µm, cylindrical to narrowly clavate or lanceolate to fusiform with rounded apex and dense contents. Stipe trama composed of numerous nested sphaerocytes surrounded by connective hyphae. Clamp connections absent in all tissues. 
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