Russula coronaspora Song & Xie & Buyck 2021
Creators: name: Song, Yu
name: Xie, Xiu-Chao
name: Buyck, Bart
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Russulales
Russulaceae
Russula
Russula coronaspora

description: Russula coronaspora Y.Song sp. nov.
MycoBank: MB837425
Index Fungorum: IF558819
Figs 3–4, 7A
Diagnosis
Russula coronaspora sp. nov. is mainly characterized by its small basidiocarps with pinkish brown pileus, interveined lamellae with few lamellulae, small spores ornamented with sparse, cylindrical and isolated spines, hymenial and dermatocystidia weakly SV+ or SV-, pileipellis gelatinized and orthochromatic in cresyl blue, pileocystidia mostly septate and sometimes branched.
Etymology
Named after its basidiospores which resemble a coronavirus.
Type material
Holotype CHINA • Guangdong Province, Zhaoqing City, Dinghushan Biosphere Reserve, on the ground in evergreen broad-leaf forest; 22 Apr. 2019; Y. Song, K19042201; GenBank nos: MN275689 (ITS), MN839580 (nLSU), MN839630 (mtSSU), MT085562 (rpb1), MT085657 (rpb2), MT085600 (tef1); GDGM79711.
Additional material examined
CHINA • Guangdong Province, Zhaoqing City, Dinghushan Biosphere Reserve, on the ground in evergreen broad-leaf forest; 6 Apr. 2016; Y. Song, K16040650; GenBank no: MN275690 (ITS); GDGM79712.
Description
Basidiocarp small sized. Pileus 2.5–4 cm in diam., hemispherical to convex at first, turning applanate with depressed center at maturity; surface glabrous, dry, viscid when wet, pinkish (#FDF2E9) or brownish (#FCF3CF), sometime white (#FFFFF0) at margin; margin entire, sometimes cracked, striate when young. Lamellae white (#FFFFF0), interveined, mixed with few, dispersed shorter lamellulae; edge entire, concolorous, smooth. Stipe central, 2–3.5 × 0.5–1 cm, cylindrical, sometimes tapering upwards, solid at first, turning spongy to hollow with age, fleshy, fragile, white (#FBFCFC). Context white, not changing when bruised; taste mild; odor indistinct. Spore print pale cream (#FBFBEF).
Basidiospores subglobose to ellipsoid, rarely globose, very small, (60/3/2) (4.5–)4.7–5.1–5.6 (–6.2)× (3.6–) 3.8–4.2–4.6(–4.8) μm, [Q = 1.12–1.20–1.32(–1.38)], hyaline in 5% KOH; ornamentation amyloid, spines cylindrical to subclavate, sometimes tapering upwards or downwards, less than 2 μm in height, sparsely distributed [2–(4–) 5 in a 3 μm diam. circle], isolated, long warts scattered, never connected; suprahilar spot indistinct, amyloid. Basidia clavate, 2- or 4-spored, thin-walled, often with irregular contents or droplets, (19.5–)21.5–25–30(–35) × 7–9–10.5(–11) μm; sterigmata 2.4–5.1×1.2– 1.5 μm. Hymenial gloeocystidia on gill sides subcylindrical to fusiform, with papillate, mucronate or branched apices, thin-walled, with irregular refractive contents, weakly SV+ or SV-, (21–)23.5–33– 49(–51) × 4.5–5.5–7.5 μm; on gill edges not abundant, 33–40–46(–50) ×4.5–5–6 μm. Subhymenium pseudoparenchymatous.
Lamellar trama composed of numerous sphaerocytes surrounded by connective hyphae, sphaerocytes up to 21 × 19 μm. Pileipellis orthochromatic in cresyl blue, gelatinized, composed of ascending to erect hyphae, 33–80 μm thick; terminal cells cylindrical, with obtuse or tapering apices, thin-walled, hyaline, (7.5–)8.5–14–19(–24) ×1.5–2–3 μm. Pileocystidia abundant, cylindrical to fusiform, with obtuse or tapering apices, mostly 1- or 2-septa, sometimes branched, with refractive contents, weakly SV+ or SV-, (29–)30.5–62–94.5(–98.5) ×3–4.5–6(8.5) μm. Stipitipellis a cutis, composed of septate and hyaline hyphae measuring 1–3 μm wide; terminal cells cylindrical with obtuse apices, thin-walled, hyaline. Caulocystidia frequent, cylindrical, obtuse or papillate, mostly septate, with refractive contents, (30.5–)33–39.5–49(–57.5)×2–3–4 μm. Clamp connections absent in all tissues.
description: Published as part of Song, Yu, Xie, Xiu-Chao & Buyck, Bart, 2021, Two novel species of subgenus Russula crown clade (Russulales, Basidiomycota) from China, pp. 15-33 in European Journal of Taxonomy 775 on pages 17-25, DOI: 10.5852/ejt.2021.775.1543, http://zenodo.org/record/5578352