Sarcodon lidongensis 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 lidongensis Y.H. Mu & H.S. Yuan sp. nov. Figures 8 , 9 , 10

Diagnoses.

Differs from Sarcodon joeides in having shorter, more or less decurrent spines, the absence of gloeoplerous hyphae, shorter basidia sterigmata and narrower basidiospores.

Type.

China. Yunnan Province, Lidong County, Qunlong Villa, 26°35'28"N, 99°24'16"E, 2400 m alt., solitary to concrescent, on the ground in Fagaceae forest, 24.07.2018, Wei 8365 (holotype: IFP 019357).

Etymology.

Lidongensis , refers to Lidong County, where the specimens were collected.

Description.

Basidiocarps annual, simple to concrescent, soft and freshy when fresh, becoming firm and light in weight upon drying; taste bitterish, odour farinaceous when dry. Pileus planar and circular when young, later plano-convex to somewhat depressed and regular orbicular with age, up to 35 mm across and 5-8 mm thick at centre. Pileal surface light brown (6D7) to brown (7E8), azonate, velutinate, then matted, appressed squamose to rimose when fresh, and purplish-brown at the pileal margin, dark brown in centre, becoming scrobiculate and verrucose when dry; margin incurved and occasionally incised with age. Spine surface greyish-orange (6B3) to brown (6E6) when fresh, light brown (6D5) to brown (6E7) when dry; spines up to 1 mm long, base up to 0.2 mm diam., conical, 4-6 per mm, more or less decurrent on stipe, with spines at pileus margin, brittle when dry. Context not duplex, up to 6 mm thick, orange white (5A2) to yellowish-brown (5D6), firm; stipe central, up to 4.5 cm long and 1 cm diam., fleshy when fresh, rigid upon drying, light brown (6D6) to dark brown (6F6), fibrillose, inside solid, cylindrical or broadened 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, occasionally branched, simple-septate, inflated, interwoven, mostly 5-9 μm diam.

Spines. Tramal hyphae hyaline, thin-walled, occasionally branched, more or less parallel along spines, frequently simple-septate, straight, sometimes flexuous and collapsed, 2-4 μm diam. Cystidia and cystidioles absent. Basidia clavate, thin-walled, with four sterigmata (2.0-3.0 μm long), simple-septate at base, 19.2-39.3 × 3.0-7.2 μm; basidioles similar to basidia.

Basidiospores irregular ellipsoid to subglobose, brown, thin-walled, tuberculate, CB-, IKI-, (4-)4.1-6(-6.1) × (3.9-)4-5(-5.1) μm, Lm = 5.5 μm, Wm = 4.9 μm, Q = 1.15-1.20 (n = 60/2); tuberculi usually isolated or grouped in 2 or more, bi- to trifurcate-like in shape, up to 1.0 μm long.

Additional specimen examined

- China. Yunnan Province, Lidong County, Qunlong Villa, 26°35'28"N, 99°24'16"E, 2400 m alt., solitary to concrescent, on the ground in Fagaceae forest, 24.07.2018, Wei 8329 (IFP 019358).

Figures

Figure 8. Basidiocarps of Sarcodon lidongensis (holotype: IFP 019357).

Figure 9. SEM of basidiospores of Sarcodon lidongensis (holotype: IFP 019357).

Figure 10. Microscopic structures of Sarcodon lidongensis (drawn from IFP 019357) a basidiospores b section of hymenophoral trama with basidia c hyphae from pileal context.