Infundibulicybe rufa Q. Zhao, K.D. Hyde, J.K. Liu & Y.J. Hao, 2016

Zhao, Qi, Hao, Yan-Jia, Liu, Jian-Kui, Hyde, Kevin D., Cui, Yang-Yang, Brooks, Siraprapa & Zhao, Yong-Chang, 2016, Infundibulicybe rufa sp. nov. (Tricholomataceae), a reddish brown species from southwestern China, Phytotaxa 266 (2), pp. 134-140 : 136

Infundibulicybe rufa Q. Zhao, K.D. Hyde, J.K. Liu & Y.J. Hao , sp. nov. Fig. 2

Index Fungorum number: IF 551687, Facesoffungi number: FoF 01345.

Etymology:— rufa (Lat.) indicates reddish brown pileus and stipe of this species.

Pileus plane at first, becoming umbilicate or slightly infundibuliform when mature, 3–6 cm high, 3–6 cm broad, margin incurved at first, wavy to undulate when mature; reddish brown (7C8–7E8) when fresh, dark brownish (7E7) when dried, occasionally hygrophanous; context thin, white. Lamellae decurrent, moderately crowded, pale (2A2), cream (4A3) to pastel yellow (2A4–3A4), up to 2.5 mm broad, sometimes forked or intervenose, edges even, concolorous. Stipe 4–7 × 0.5–1 cm, cylindrical, longitudinally striate, surface concolorous with the pileus surface, internal stuffed with white medulla, the base often with white tomentum adhering to leaves or woody debris; context thin, elastic, usually hygrophanous in the stipe. Odor and flavor fungoid. Spore print white.

Basidia 27–36 × 5–7.5 μm, clavate, usually four-spored, sterigmata 3–4 μm long, basal septum often clamped. Basidiospores [100/4/4] (6–) 6.5–9 × 4–5 (–5.5) μm, Q = (1.2–)1.4–2, Q = 1.64 ± 0.17, elliptical in face view, lacrymoid in side view, smooth, hyaline, thin-walled, non-amyloid. Pileipellis slightly ixohymeniderm, composed of more or less radially arranged filamentous 2–10 μm wide hyphae, cylindrical to subclavate, clamp connections common, with encrusting pigment. Hymenophoral trama subregular, hyaline, elongate to cylindrical, clamp connections common. Cystidia and marginal cells absent.

Habitat and distribution:—Scattered or gregarious in forests dominated by Picea retroflexa Mast. and P. purpurea Mast. Only known from high altitude localities in southwestern China.

Typification:— CHINA. Sichuan Prov.: Jiuzhaigou County, alt. 3200 m, 20 June 2014, Qi Zhao 2061 (HKAS 87741, holotype!).

Additional specimens examined:— CHINA. Sichuan Prov.: Jiuzhaigou County, 22 June 2014, Q. Zhao2047 ( HKAS 87727 , paratype!) ; Ibid., 23 June 2014, Q. Zhao T24394 ( HKAS 87760 !), Y. J. Hao 1120 ( HKAS 82911 !), Q. Cai 1030 ( HKAS 83492 !) .

Figures

FIGURE 2. Infundibulicybe rufa. a–d. Typical mature specimens (a. HKAS 87741, holotype!; b–c. HKAS 87727, paratype!, d. HKAS 87760!); e. Basidia and basidioles; f. Basidiospores; g. Radial-vertical section of pileipellis. Scale bars: a–d = 1 cm; e, f = 5 μm; g = 10 μm.