Sarcodon coactus 2020

Sarcodon coactus Y.H. Mu & H.S. Yuan, sp. nov. 2020

MycoBank No: 833889

Holotype: China. Yunnan Province, Chuxiong, Zixishan Nat. Res., 24°58'28"N, 101°22'13"E, 2000 m alt., solitary to gregarious, on the ground in Fagaceae forest, 19.07.2018, Wei 8094 (holotype: IFP 019351).

Morphological description

Basidiocarps annual, solitary to gregarious, soft and fleshy when fresh, becoming firm and light in weight upon drying; taste none, odour farinaceous when dry. Pileus planar, ellipsoid when young, later round with age, up to 35 mm across and 4–8 mm thick at centre. Pileal surface reddish-brown (8D5) to dark brown (8F8), azonate, pubescent, floccose to felted when fresh, becoming smooth, rugose, scrobiculate when dry; margin white (7A1) when fresh, greyish-brown (7D3) with age, incurved, rarely lobed. Spine surface white (4A1) to yellowish-white (4A2) when fresh, brownishorange (5C5) to yellowish-brown (5F6) when dry; spines up to 2.1 mm long, base up to 0.3 mm diam., conical, 3–5 per mm, decurrent on stipe, without spines at pileus margin, brittle when dry. Context not duplex, up to 6 mm thick, light brown (5D5), firm; Stipe central, up to 5.5 cm long and 1.3 cm diam., fleshy, greyish-brown (8D3) to violet brown (10F7) when fresh, becoming hollow with age, greyish-orange (5B3) to dark brown (7F7) upon drying, rugous, columniform or attenuate below with bulbous base when old.

Hyphal structure. Hyphal system monomitic; generative hyphae with simple-septa, CB–, IKI–; tissues olivaceous in KOH.

Context. Generative hyphae hyaline, thin-walled, rarely branched, simple-septate, inflated, partly short-celled, interwoven, mostly 4–10 μm diam.

Spines. Tramal hyphae hyaline, thin-walled, frequently branched, more or less parallel along spines, frequently simple-septate, straight, 2–5 μm diam. Cystidia and cystidioles absent. Basidia clavate, thin-walled, with four sterigmata (3.1–5.2 μm long), simple-septate at base, 16.5–50 × 6.2–9.4 μm; basidioles similar to basidia.

Basidiospores irregular subglobose, brown, thin-walled, tuberculate, CB–, IKI–, 

(5.1–)5.7–7(–7.1) × (4.6–)4.7–5.9(–6) μm, Lm = 6.2 μm, Wm = 5.3 μm, Q = 1.17– 1.18 (n = 60/2); tuberculi usually isolated or grouped in 2 or more, bi- to trifurcatelike in shape, up to 1.0 μm long.

Habitat: on the ground in Fagaceae forest.

Distribution: China.

GenBank Accession: ITS: MN846278;28S: MN846287

Notes: 

Reference: Mu Y-H, Hu Y-P, Wei Y-L et al.(2020) Hydnaceous fungi of China 8. Morphological and molecular identification of three new species of Sarcodon and a new record from southwest China. MycoKeys 66: 83–103. https:// doi.org/10.3897/mycokeys.66.49910

A basidiocarp of Sarcodon coactus (holotype: IFP 019351).