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Page number:126 
Remarks (internal):Russula periglypta was first described by Berkeley & Broome (1871) with a very scanty description based on material (Thwaites 800, K) collected in Peradeniya in 1868. Petch (1910) gave a better macroscopic description of the species, presumably based on his own field observations. Patouillard (1913) recorded it from Vietnam. Pegler (1986) provided a modern description of the species based on his examination of the type material now preserved in Kew Herbarium.
Our examination of the Kerala collections and the type material revealed that they were conspecific. The pale yellow, slightly viscid pileus that becomes tuberculate-striate and sulcate up to half the way from margin with age is a diagnostic field character of this species. The shape of the basidiospores and the length of the spinose projections showed considerable variations amongst the five Kerala collections studied. The range of Q value was 1-1.5 and the range of length of the spinose projections was 1-3 µm. Similarly, the presence of pileocystidia is another variable character, as we could not see them in some collections. We are of the opinion that this variability in the basidiospore morphology and distribution of pileocystidia should be considered during microscopic identification of this species. Also, unlike Pegler (1986), we observed scattered macrocystidia on both edges and sides of lamellae, and they projected up to 22 µm beyond the level of tips of basidia.
Russula periglypta belongs to subgen. Ingratula Romagn. sect. Ingratae (Quél.) Maire subsect. Foetentinae (Melzer & Zvára) Singer.

 
Description type:Non-original description 
Description:Russula periglypta Berk. & Broome, Journ. Linn. Soc., Bot. 11: 566 (1871). Fig. 1
Basidiomata medium-sized to somewhat large. Pileus 25-90 mm diam., initially convexo-hemispherical with a slightly depressed centre, then applanate with a depressed centre and finally almost infundibuliform; surface initially pale yellow (4A2, 4A3), later greyish brown (5B2, 5D2, 5E2), slightly viscid, initially smooth and pellucid-striate towards margin, becoming tuberculatestriate and sulcate up to half the way from margin with age; margin initially slightly incurved and entire, becoming straight or almost upturned and fissile. Lamellae adnexed to adnate, whitish or marble white (5A2), close to almost crowded, up to 10 mm broad, rarely furcate, with occasional lamellulae, with abundant interveining; edge entire, concolorous with the sides. Stipe 25-90 - 6-22 mm, central, terete, mostly tapering towards base, occasionally tapering towards both ends, stuffed or hollow; surface whitish or marble white (5A2), glabrous. Odour mild, spicy. Spore-print whitish. Chemical spot tests on stipe surface: FeSO4: no reaction in the beginning, slowly turning pinkish brown; aniline: no reaction; aqueous phenol: chocolate brown.
Basidiospores 5-8 - 4-7.5 µm, Q = 1-1.5, QM = 1.2, globose, subglobose or ovo-ellipsoid, thin-walled, hyaline, strongly amyloid, with 1-3 µm long spinose projections and connectives forming a partial reticulum. Basidia 22-60 - 4-16 µm, clavate, thin-walled, hyaline, 4-spored; sterigmata up to 7.5 µm long. Lamella-edge heteromorphous, with scattered macrocystidia. Macrocystidia 22-70 - 3-14 µm, sinuoso-fusoid, with an apex that is either mucronate or capitate, or with a moniliform appendage, hyaline, thin-walled, projecting up to 22 µm beyond the level of tips of basidia, with amorphous contents, not staining with sulfovanillin. Lamellar trama irregular; hyphae 2-12.5 µm wide, hyaline, thin-walled, intermixed with groups of sphaerocytes, 8-35 - 7.5-32 µm, inamyloid. Subhymenium poorly developed. Pileus trama interwoven; hyphae 2-8 µm wide, hyaline, thin-walled, intermixed with numerous sphaerocytes, 11-40 - 11-40 µm, inamyloid. Pileipellis an ixocutis tending to form an ixotrichodermium at places; hyphae 2-8 µm wide, loosely arranged, suspended in a gelatinized matrix, devoid of encrustations; pileocystidia scattered or not seen in some collections, 30-70 - 2-6 µm, sinuoso-fusoid, with an apex that is either mucronate or capitate, or with a moniliform appendage, hyaline, thin-walled, not staining with sulfovanillin. Stipitipellis a cutis; hyphae 2-6.5 µm wide, hyaline, thin- walled, inamyloid, devoid of encrustations; caulocystidia absent. Clamp-connections not observed on any hyphae.
Habitat: On the ground, scattered in the proximity of a Vatica chinensis (Dipterocarpaceae) tree.
Specimens examined: Sri Lanka. Central Province, Kandy District, Peradeniya, Nov. 1868, Thwaites 800 cum icon (K(M)165414, holotype).
 
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