Russula alboareolata

Russula alboareolata Hongo

Index Fungorum number: IF114009

Pileus 22 – 60 mm diam., convex when young, then plane with a depressed centre when mature, surface slightly viscid when moist, small patches at centre, yellowish white (N155D) to pale yellow (161D), white (N155D), margin incurved when young and becoming upturned when mature, striate-sulcate. Lamellae 20–80 mm wide, adnexed, close, white (N155C), easily fragile, unchanging when bruised, with lamellulae in 2–3 series, edge entire. Stipe 15–33 × 7–15 mm, central, cylindrical to narrowly clavate with broadened or tapered base, surface smooth, white (N155D). Context solid to stuffed or hollow when mature in stipe, white. Taste mild. Odour indistinct. Spore print white. Basidiospores 7.5–8.75 × 5–7.5 μm (Q= 1.16 –1.33 – 1.50), sub globose to ellipsoid, ornamentation composed of amyloid warts, mostly lower than 1 μm high. Basidia 40–62.5 × 7.5–12.5 μm, subclavate to pyriform, with 4 spores; sterigmata 1.11 – 3.71 μm long. Pleurocystidia 57.5 – 75×7.5 – 15 μm, not abundant, fusoid to lanceolate, with mucronate to capitate, thin-walled. Cheilocystidia absent. Lamellar trama composed of numerous and surrounded connective hyphae; sphaerocytes globose to elliptical. Pileipellis palisade to trichopalisade. Pileocystidia not observed.

Fig. 1 Phylogenetic tree of eight Russula specimens, one Lactarius specimen (indicated in bold), and some reliable best-hit sequences from GenBank database using Maximum Likelihood method. Number at the node indicates bootstrap values. Termitomyces microcarpus was used as an outgroup.