Rhodonia tianshanensis Yuan Yuan & L.L. Shen, 2017

Yuan, Yuan & Shen, Lu-Lu, 2017, Morphological characters and molecular data reveal a new species of Rhodonia (Polyporales, Basidiomycota) from China, Phytotaxa 328 (2), pp. 175-182 : 181

Rhodonia tianshanensis Yuan Yuan & L.L. Shen sp. nov. ( Figures 2–3 )

MycoBank no.:—MB 821993

Type:— CHINA. Xinjiang Autonomous Region, Gongliu County, West Tianshan Nature Reserve, on stump of Picea , 14 September 2015, Dai 15934 (Holotype, BJFC 020035).

Etymology:— Tianshanensis (Lat.) : refers to type locality of Tianshan in China.

Diagnosis:—Differing from Rhodonia placenta by having fusoid cystidioles.

Description: —Basidiocarps annual, resupinate to subpileate, soft corky, without odor or taste when fresh, becoming corky to fragile upon drying, up to 15 cm long, 5.5 cm wide and 1.5 cm thick at center, not easily separated from the substrate. The subpileus white when fresh, becoming pale brown when dry. Pore surface white to cream when juvenile, pinkish buff with age, becoming pale brown to brown upon drying; sterile margin narrow to almost lacking; pores angular, 3–4 per mm; dissepiments thin, entire when juvenile, becoming lacerate with age. Tube layer oblique, clay-buff, fragile, up to 1.5 mm long. Subiculum white when fresh, cream when dry, corky, very thin to almost lacking. Hyphal system monomitic; composed of generative hyphae with clamp connections, IKI–, CB –; tissues unchanged in KOH. Context composed of hyaline, thin-walled, generative hyphae, occasionally branched, interwoven, 4–5.5 μm diam. Tubes composed of hyaline, thin- to slightly thick-walled generative hyphae, infrequently branched, interwoven, 2.5–4 μm in diam. Cystidioles fusoid, hyaline, thin-walled, 25–38 × 4–6 μm. Basidia clavate, hyaline, bearing four sterigmata and a basal clamp connection, 18–22 × 3–5 μm; basidioles in shape similar to basidia, but distinctly smaller. Basidiospores cylindrical, hyaline, thin-walled, smooth, IKI–, CB –, (5–)5.2–5.5(–5.8) × (2.4–)2.5–2.8(–3) μm, L = 5.42 μm, W = 2.72 μm, Q = 1.86–1.96 (n = 60/2).

Additional specimen examined (paratype):— CHINA. Xinjiang Autonomous Region, Gongliu County, West Tianshan Nature Reserve, on rotten wood of Picea , 13 September 2015, Dai 15915 ( BJFC 020016).

Figures

FIGURE 2. Basidiocarp of Rhodonia tianshanensis (BJFC020035). Bar: 2.5 cm. Photo by: Yu-Cheng Dai.

FIGURE 3. Microscopic structures of Rhodonia tianshanensis (draw from the holotype). a: Basidiospores; b: Cystidioles; c: Basidia and basidioles; d: Hyphae from trama; e: Hyphae from context. Bars a=5 μm, b–e=10 μm.