Aporpium miniporum F. Wu, Y.C. Dai & L.W. Zhou, 2017

Wu, Fang, Zhou, Li-Wei, Yuan, Yuan & Dai, Yu-Cheng, 2017, Aporpium miniporum, a new polyporoid species with vertically septate basidia from southern China, Phytotaxa 317 (2), pp. 137-143 : 140-142

Aporpium miniporum F. Wu, Y.C. Dai & L.W. Zhou , sp. nov. ( Fig. 2 )

MycoBank MB 815397

Type.— CHINA. Hainan Province, Wuzhishan County, Wuzhishan Tropical Forest Park , alt. 1300 m, on rotten angiosperm wood, 15.XI.2015, Dai 16239 ( BJFC) .

Etymology.— miniporum (Lat.) refers to the small pores of the species.

Description.— Basidiocarps annual, resupinate to effused-reflexed or pileate, leathery and without odour and taste when fresh, becoming hard corky to bone hard up on drying. Pileus broadly sessile, semicircular to fan-shaped, thin, laterally fused and imbricate, projecting up to 3 mm long, 2 cm wide and about 1 mm thick, thinning towards the margin; margin acute, wavy; when resupinate up to 7 cm long and 20 mm wide. Upper surface cinnamon buff when fresh, becoming cinnamon to yellowish brown upon drying, indistinctly zonate, velutinate to glabrous. Pore surface cream when fresh, becoming brownish when bruised, pinkish buff when dry; pores mostly round, 8–9 per mm; dissepiments thin to slight thick, entire. Context cinnamon buff, hard corky, around 0.3 mm thick. Tube layer concolorous with the pore surface, distinctly different from context, up to 0.7 mm long.

Hyphal system dimitic; generative hyphae infrequent, rarely with clamp connections, skeletal hyphae dominant, IKI–, CB+; tissue unchanged in KOH. Contextual generative hyphae infrequent, colorless, thin-walled, unbranched, frequently encrusted with fine crystals, 2.5–4 μm diam; skeletal hyphae dominant, thick-walled with a narrow to medium lumen, unbranched and encrusted with fine crystals, flexuous, interwoven, 3–5 μm diam. Tramal generative hyphae infrequent, colorless, thin-walled, rarely branched and encrusted with fine crystals, 2.5–3.5 μm diam; skeletal hyphae dominant, thick-walled with a narrow to medium lumen, unbranched, occasionally encrusted with fine crystals, flexuous, interwoven, gelatinous, 3–4.5 μm diam. Cystidia and cystidioles absent; basidia barrel-shaped, colorless, thin-walled, vertically septate, with four sterigmata, a simple septum at middle and a clamp connection at the base, 7–10 × 5–8 μm; basidioles barrel-shaped without any septum but a clamp connection at base, distinctly smaller than basidia; large rhomboid crystals occasionally present along hymenium. Basidiospores slightly allantoid, colorless, thin-walled, smooth, occasionally bearing one or two small guttules, IKI–, CB–, (3.9–)4–5(–5.3) × (2–)2.5–3.2(–3.5) μm, L = 4.47 μm, W = 2.86 μm, Q = 1.51–1.63 (n = 60/2).

Additional specimens examined (paratypes).— CHINA. Hainan Prov., Lingshui County, Diaoluoshan Forest Park , alt. 1200 m, on rotten angiosperm wood, 5.IX.2008, Dai 10334 ( IFP), 13.XI.2015, Dai 16093 & 16118 ( BJFC) ; Qiongzhong County, Limushan Forest Park , alt. 1100 m, on rotten angiosperm wood, 24.V.2008, Dai 9582 ( IFP) .

Figures

FIGURE 2. Microscopic structures of Aporpium miniporum (drawn from holotype).a: Basidiospores. b: Basidia and basidioles. c: Hyphae from trama. d: Hyphae from subiculum.