taxonID	type	description	language	source
039E87A7FFB63605FF3AD6A8FC19F803.taxon	diagnosis	Diagnosis: — differs from the other sequestrate Russula by pileus surface and hymenophore brownish red to deep brown; basidiospores yellowish-brown to brown, globose to subglobose, ornamented with very densely isolated amyloid spines of 1 – 2 μm long; cystidioles sporadically, having conspicuous amorphous contents; pileocystidia absent. Etymology: — subterranea, hypogeous, in reference to the habitat of this new species. Holotype: — CHINA. Shanxi: Qinyuan County, Lingkongshan Mountain, in soil under Quercus sp., 1 Nov 2017, collected by K. B. Huang (BJTC FAN 1153). Description: — Basidiomata hypogeous, 1 – 2 × 2 – 3 cm, globose to subglobose. somewhat lobate, sessile. Pileipellis surface smooth to pruinose, brownish red (# cc 9900) to deep brown (# cc 6600). Hymenophore irregularly loculate, locules compacted, slightly labyrinthine, brownish red (# cc 9900) to deep brown (# cc 6600). Columella rudimentary to absent. Odor indistinct; taste a little sour. Lamellae arranged along both sides of the locules of Hymenophore, showing an irregular circular to labyrinthine pattern, reddish-brown (# cc 9900) when fresh, brown (# cc 6600) when dry. Basidiospores globose to subglobose, 8.5 – 13 (14) × 8.9 – 13.5 (15) μm, Q = 1.0 (0.93) – 1.05, yellowish-brown to brown in water, slightly thick-walled, ornamented with amyloid, isolated spines of 1 – 2 μm long, spines dense, very broad at base, with a very narrow distance between the base of spines; hilar appendage usually conspicuous, 1 – 2.5 μm long; Basidia broadly clavate, broadly cylindrical, 17.7 – 33.4 × 6.9 – 12.8 μm, 2 – 4 - spored, the sterigmata up to 3 – 9 μm long; cystidioles 25.2 – 40.2 × 5.5 – 10.4 μm, subclavate to clavate with rounded apices, with amorphorus contents, sporadically, arising in trama, not extending beyond basidia. Pleurocystidia 30 – 50 × 5 – 15 μm, fusoid or ventricose, apex obtuse, hyaline, unchanging in Sulfovanillin. Subhymenium 6 – 15 μm wide, composed of isodiametric cells 6 – 16 × 3 – 12 μm, cells 1 – 2 layered; hymenophoral trama textura intricata, hyphae hyaline, tortuous, 2.7 – 5.8 μm diam. Pileus context 33 – 56.3 μm thick, pseudoparenchymatous, composed of polygonal cells of 2 – 5 μm diam, mixed with a few of trichodermal hyphae; subpellis a textura intricata formed by short, cylindrical to fusiform hyphae 6.4 – 15 × 3 – 7.9 μm, hyphae more or less parallel; pileocystidia absent; pileipellis composed of loosely interwoven, 54.1 – 77.6 μm thick, hyaline hyphae 2 – 4 μm diam., sphaerocytes absent. Habit, habitat and distribution: — hypogeous, gregarious, in mountain brown earth and cinnamon soil, found under Quercus sp. in Shanxi Province, China. Other material examined: — CHINA. Shanxi Province: Qinyuan County, Lingkongshan Mountain, in soil under Quercus sp., 1 Nov 2017, collected by K. B. Huang (BJTC FAN 1154).	en	Fu, Hao-Yu, Li, Ting, Fan, Li (2025): Russula subterranea, a new sequestrate species of Russulaceae from China. Phytotaxa 695 (1): 80-90, DOI: 10.11646/phytotaxa.695.1.3, URL: https://doi.org/10.11646/phytotaxa.695.1.3
