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 Add this item to the list  804167 Original description
   
Remarks (public):Russula sharmae can easily be recognized by the bright red pileus, pink-flushed stipe that tapers towards the base, the partly concolorous, partly reddish lamellar edge, basidiospores with isolated warts and the particular structure of the lamella edge. Considering the coloration of pileus, nature of the context (turning red with SV) and nature of pileipellis, our species is similar to R. rosea Pers. and R. minutula var. robusta Saini, Atri & Singer, both reported from India. However, both R. rosea (Romagnesi 1985, Saini et al. 1989, Kränzlin 2005) and R. minutula var. robusta (Saini et al. 1982) can be distinguished from the present species by the absence of an umbo on the pileus, and a spore ornamentation that is more typical of Roseinae (partial reticulum or warts connected by veins). 
Description type:Original description 
Description:Pileus 70-140 mm diam., convex when young, mostly planoconvex to slightly uplifted (infundibuliform) with maturity, centre often unbonate, later depressed. Pileipellis viscid to glutinous with strongly sulcate margin; completely red (a: 42) when young, gradually turning scarlet (a: 43) with yellow (a: 5E) blotches in the centre; margin incurved when young, gradually decurved with maturity, paler (b: 10A4-10A3) or slowly fading. Lamellae free to narrowly adnexed, subdistant (5-6/cm at pileus margin) after maturity, forked near the pileus margin, white when young, turning saffron (a: 49) at maturity, unchanging after bruising; edge concolorous but reddish near pileus margin (up to 15 mm from pileus margin); lamellulae absent. Stipe 80-145 × 12-25 mm, centrally broadened and gradually tapering towards base, white (b: 1A1) with pink-flush or with tinge of rose (a: 39). Context solid to stuffed in stipe, white (b: 1A1) chalky, unchanging after bruising or with KOH, turning pale saffron (b: 4A5) with FeSO4, reddish orange (b: 7A7) with guaiac; context of dry sample turning lobster (red) (b: 9B8-10C8) with sulfovanillin. Taste not recorded. Odour indistinctive. Spore print pale yellow (b: 3A3). Basidiospores 6.8-7.3-7.9 × 6.0-6.6-7.0 µm (Q = 1.04-1.11-1.18), globose to subglobose or broadly ellipsoid; ornamentation amyloid, up to 1 µm high, composed of isolated warts; high warts spinoid with rounded apices, rarely fused with each other (but, no connectives or veins in between); some low conical warts between high warts; suprahilar plage distinct, amyloid. Basidia 26-44 × 8-12 µm, subclavate, 4-spored; sterigmata 5-9 × 1.5-2.5 µm. Subhymenium up to 22 µm thick, cellular; cells globose to ellipsoid, 4-14 × 3.5-9 µm. Pleuromacrocystidia 35-80 × 7-14 µm, emergent up to 20 µm, abundant, fusiform to subclavate, with rounded apices, thick- walled (wall up to 1 µm thick towards apex), content dense. Lamellae edge of two patterns: up to 15 mm from the pileus margin (reddish part) distinctly heteromorphous, appendiculate and sterile, with marginal cells and cystidioid elements exactly as at the pileus surface; rest (concolorous part) fertile with basidia, marginal cells and cystidia. Cheilocystidioid elements 13-25 × 4-6.6 µm, encrusted, thick-walled (0.6 µm thick); marginal cells slightly fusoid, cylindrical to narrowly clavate, up to 6 µm wide without encrustations, slightly thick walled. Cheilomacrocystidia 40-60 × 10-14 µm, also abundant, fusiform to subclavate, thick walled (same as pleuromacrocystidia), content distinct; marginal cells cylindrical to clavate. Lamellar trama composed of abundant oleiferous hyphae and numerous sphaerocytes surrounded by connective hyphae (up to 7 µm wide, septate). Pileipellis thick, up to 80 µm, a palisade to trichopalisade, composed of globose to polymorphic inflated cells bearing cylindrical to fusoid thick-walled cells with encrustations, septate encrusted primordial hyphae and mostly encrusted pileocystidia; primordial hyphae 2-4.5 µm wide, slightly thick-walled; pileocystidia up to 6.5 µm wide, cylindrical to subclavate or slightly fusoid, thick walled (wall up to 0.7 µm thick). Stipitipellis a palisade, up to 125 µm thick, suprapellis of repent to erect hyphae and caulocystidia; hyphal ends 2.5-4 µm wide, septate, moderately to heavily incrusted; caulocystidia abundant, up to 6.5 µm wide, moderately incrusted, thick walled. Stipe trama composed of connective hyphae and nested sphaerocytes. Clamp connections absent in all tissues. 
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