Sarcodon grosselepidotus Y.H. Mu & H.S. Yuan, 2020

Mu, Yan-Hong, Hu, Ya-Ping, Wei, Yu-Lian & Yuan, Hai-Sheng, 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, pp. 83-103 : 83

Sarcodon grosselepidotus Y.H. Mu & H.S. Yuan sp. nov. Figures 5 , 6 , 7

Diagnoses.

Differs from Sarcodon lepidus in having shorter and slightly wider spines, fragrant odour, narrower hyphae in context, slightly wider basidia with shorter sterigmata and wider basidiospores.

Type.

China. Yunnan Province, Chuxiong, Zixishan Nat. Res., 24°58'28"N, 101°22'13"E, 2000 m alt., solitary or gregarious, on the ground in Fagaceae forest, 1.08.2005, Yuan 1247 (holotype: IFP 012529).

Etymology.

Grosselepidotus (Lat.), from the Latin word grosse and lepidotus, in reference to the coarsely scaled pileal surface.

Description.

Basidiocarps annual, solitary to gregarious, soft and freshy when fresh, becoming fragile and light in weight upon drying; taste none, odour mildly fragrant when dry. Pileus infundibuliform or circular when young, later planar and ellipsoid to round with age, occasionally deeply fissured, up to 75 mm diam. and 4-8 mm thick at centre. Pileal surface pale orange (6A3) to dark ruby (12F8), azonate, glabrous with ascending, broad and dark brown (9F5) scales when fresh, becoming scabrous, rugose when dry; margin inflexed and wavy, sometimes lobed with age. Spine surface white (4A1) to pale yellow (4A3) when fresh, light brown (6D6) to dark brown (6F8) when dry; spines up to 1.4 mm long, base up to 0.3 mm diam., conical, 4-6 per mm, strongly decurrent on stipe, without spines at pileus margin, brittle when dry. Context not duplex, up to 5 mm thick, greyish-orange (5B5), firm; Stipe central to lateral, up to 9.5 cm long and 2 cm diam., fleshy when fresh, firm upon drying, brownish-yellow (5C7) to dark brown (7F7), creased, inside solid, cylindrical 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, interwoven, mostly 7-11 μm diam.

Spines. Tramal hyphae hyaline, thin-walled, occasionally 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 (2.5-5 μm long), simple-septate at base, 23.5-55.5 × 5.3-8.2 μm; basidioles similar to basidia.

Basidiospores irregular ellipsoid to globose, brown, thin-walled, tuberculate, CB-, IKI-, (5-)5.1-6.4(-6.6) × (4-)4.1-5.9(-6) μm, Lm = 5.5 μm, Wm = 4.9 μm, Q = 1.13-1.19 (n = 60/2); tuberculi usually isolated, sometimes grouped in 2 or more, bi- to trifurcate-like in shape, up to 0.7 μm long.

Additional specimen examined

- 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 8075 (IFP 019353), Wei 8097 (IFP 019354), Wei 8120 (IFP 019355) and Wei 8128 (IFP 019356).

Figures

Figure 5. Basidiocarps of Sarcodon grosselepidotus (holotype: IFP 012529).

Figure 6. SEM of basidiospores of Sarcodon grosselepidotus (holotype: IFP 012529).

Figure 7. Microscopic structures of Sarcodon grosselepidotus (drawn from IFP 012529) a basidiospores b section of hymenophoral trama with basidia c hyphae from pileal context.