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 Add this item to the list  827272 Original description
Remarks (public):The sticky and strongly tubercualte-striate pileus, the spores with isolated warts and the pileipellis with numberous pileocystidia of this new species strongly suggest R. shingbanensis, a species newly described from Himalayan India (Das et al. 2014). The affinity is supported by the ITS sequence data (Fig. XXX). Russula maguanensis has a pileus with purplish rose-red as the dominant color, much more vivid than the “grayish green” pileus of the Indian species. The finely cracked cuticle of the pileus is very striking and is not reported on R. shingbaensis. For more notes, see under R. substriata.
A short ITS sequence (AB509981, only ITS2) from a Japanese sample (Yakushima island) has only two base pairs different from that of R. maguanensis. We did not inlude this sequence in the phylogentic analysis due to the short fragment, but believe the Japanese sample belongs to R. maguanensis.
Description type:Original description 
Description:Pileus 45 mm diam., concave with applanate margin, almost flat in the extreme centre, strongly tuberculate-striate, finely cracked even when humid, purple red, margin much paler than the centre, in the extreme centre getting paler, slimy-glutinous when wet, cuticle nearly completely separable. Stipe 45 × 7 mm, central, cylindrical, no cavities but soft and spongy under cortex, uniformly white. Lamellae 3.5 mm wide, adnate, shorter lamellulae few, strongly anastomosing towards flesh, anastomosing and forming zone around stipe, brittle, cream white. Context white, 1 mm thick in the pileus.Taste acrid. Odour none. Spore print not obtained.
Basidiospores (40/1/1/) (7.5) 8.0‒8.6‒9.5× (6.5) 7.0‒7.5‒8.5 µm [Q = (1.06) 1.08‒1.24 (1.25), Q= 1.15 ± 0.05], broadly ellipsoid to ellipsoid, rarely subglobose; ornamentation amyloid, 0.5‒1.5 µm high, composed of isolated warts never fused, base of warts 0.3‒1.0 µm in diam., conical or blunt, rarely truncate at the apex; suprahilar plage inamyloid, rarely slightly distally amyloid. Basidia 30‒50 (60) × 9‒15 µm, subclavate, 4-spored. Pleuromacrocystidia 45‒80 × 9‒14 µm, common, mostly buried among the basidia-layer, some projecting up to 20 μm beyond the basidia-layer, fusiform, often mucronate or even monoliform at the apex, with dense granular or crystalline contents. Lamella edge sterile; cheilomacrocystidia common, 32‒52 × 7‒12 µm, fusiform, rarely lanceolate, often moniliform at the apex, with dense contents. Lamellar trama composed of rosettes and connective hyphae, sphaerocystes of rosettes 15‒30 μm in diam., connective hyphae 2‒5 μm wide. Pileipellis an ixo-intricata with outermost cuticle a trichoderm, 500‒800 µm thick; outmost layer 50‒70 μm thick, composed ofnumerous pileocystidia and fusiform septate cells; pileocystidia (23) 30‒46 × 5‒10 µm, fusiform, sublanceolate, often mucronate to moniliform at the apex, with granular or crystalline contents, nearly colorless; hyphae beneath the outermost cuticle loosely intricate, 2‒3 μm wide, often branching, hyaline, becoming repent and slightly wider (2‒4 μm) towards pileus trama. Stipitipellis a cutis, 30‒60 µm thick; caulocystidia common, 25‒44 × 5‒7 µm, fusiform, rarely sublanceolate or subcylindrical. Pileus and stipe trama with numberous rosettes and connective hyphae; sphaerocystes of rosettes 13‒70 µm in diam, connective hyphae 3‒8 µm wide. Clamp connections absent.
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