Russula cf. pseudobubalina
Russula cf. pseudobubalina
Pileus 21–68 mm diam., convex when young, then plano-convex with a depressed centre to plane when mature; surface smooth, viscid when moist, light reddish brown (177B) or dark greyish yellow (199D); margin incurved when young and becoming decurved when mature. Lamellae 40–60 mm wide, adnexed, rather close, white (NN155B), pale orange yellow (159C), light yellow (163D) when mature, unchanging when bruised, with lamellulae in 3–4 series; edge entire. Stipe 21–41 × 7–14 mm, central, cylindrical or sometimes with narrowing base; surface smooth, white (NN155D) to yellowish white (156D). Context solid to stuffed or hollow stipe when mature, yellowish white, unchanging after with KOH; taste slightly bitter then acrid. Odour indistinct. Spore print not found. Basidiospores 5–7.5 μm (Q= 1 –1.07 – 1.10), globose to subglobose, ornamentation amyloid, up to 1 μm high. Basidia 18.59–35 × 4.81–8.6 μm, subclavate to clavate, with 4 spores, sterigmata 1.08 – 3.36 μm long. Pleurocystidia 40–62 × 5–12.5 μm, highly emergent, abundant, capitulate, lanceolate, thin-walled. Cheilocystidia 31.08–56.63 × 5.1–8.77 μm, lanceolate, capitulate, cylindrical, thin-walled. Lamellar trama composed of numerous sphaerocytes surrounded by connective hyphae; sphaerocytes globose to elliptical. Pileocystidia not observe.
Note: Russula cf. pseudobubalina was very similar to R. pseudobubalina due to having cinnamon buff pileus, unforked lamellae and basidiospores not forming reticulate. But Russula cf. pseudobubalina differs from R. pseudobubalina having smaller basidia, pleurocystidia and cheilocystidia.
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.