Cibaomyces glutinis Zhu L. Yang, Y.J. Hao & J. Qin, 2014

Cibaomyces glutinis Zhu L. Yang, Y.J. Hao & J. Qin View in CoL , sp. nov.

Figs. 2–4 View FIGURE 2 View FIGURE 3 View FIGURE 4

MycoBank: MB 807467

Etymology: glutinis refers to the glutinous pileus and stipe.

Type:— CHINA. Yunnan Province: Jizu Mountain , Binchuan County, 25°57'39''N, 100°23'31''E, elev. 2200 m, 3 August 2013, Jiao Qin 725 ( HKAS80855 , holotype!) GoogleMaps .

Basidiomata ( Fig. 2a–b View FIGURE 2 ) small to medium-sized. Pileus 3–4.5 cm, convex to applanate, strongly glutinous, dirty white to brownish to grayish (5B2–5B3, 5C2–5C3), finely rugose, often with brownish irregularly-shaped dots; center slightly darker. Lamellae adnate to sinuate or slightly decurrent, subdistant, with lamellulae, L = 20–25, l = 1–3, thick, dirty white to cream, sometimes with reddish to brownish spots, transversely veined, with lamellae frequently anastomosing; lamellar edge rusty brown to brownish. Context 2–3 mm thick, dirty white to brownish, unchanging in color when cut. Stipe 6–9.5 × 0.3–0.8 cm, subcylindrical, enlarged at ground line, surface dirt white to grayish, sticky, densely covered with brownish felted squamules but nearly white at apex; pseudorhiza dirty white. Taste mild; odor indistinct.

Lamellar trama ± regular, composed of branching, nearly colorless and hyaline, slightly thick-walled (≤ 1 µm thick), filamentous to inflated hyphae 3–20 µm wide. Subhymenium composed of 3–5 µm wide frequently branching hyphal segments. Basidia ( Fig. 3d View FIGURE 3 ) 50–70 × 13–15 µm, 4-spored, thin-walled, colorless hyaline, sometimes with yellowish brown contents; sterigmata up to 10 µm in length; basidioles clavate to subfusiform with subacute apex. Spores ( Fig. 3b View FIGURE 3 ) [55/2/2] (9) 10.5–14 (15) × (8.5) 9–11.5 (12.5) µm, Q = (1.0) 1.05–1.24 (1.30), Qm = 1.14 ± 0.07, subglobose to broadly ellipsoid, thin-walled, colorless and hyaline, sometimes with brownish to brown contents, non-amyloid, non-dextrinoid, cyanophilous, non-metachromatic, with ca. 25 spines conspicuous, 2–4(5) µm high and 1.5–2 µm broad at base, hollow, conical to subcylindrical spines with obtuse apex. Lamellar edge sterile, composed of crowded cheilocystidia; cheilocystida ( Fig. 3c View FIGURE 3 ) 50–130 × 4–8 µm, numerous, narrowly clavate, subcylindrical to cylindrical, often with a round to subcapitate apex, with brownish, brown to chocolate brown intracellular pigment, often incrusted brown substances. Pleurocystidia absent. Pileipellis ( Fig. 3a View FIGURE 3 ) an ixohymeniderm 40–60 µm thick, composed of clavate, broadly clavate to sphaeropedunculate, brownish to brown intracellularly pigmented cells (20–50 × 10–30 µm) embedded in a gelatinized matrix with brown to dark brown crystalline material. Pileocystidia ( Fig. 3a View FIGURE 3 ) abundant, subcylindrical to narrowly clavate, occasionally narrowly fusiform to lageniform, 40–80 × 4–8 µm, thin-walled, nearly colorless or with brownish to brown intracellular pigment, with apical parts often incrusted with brown, yellow-brown to ochraceous substances which are slowly soluble in KOH; apex narrowly rounded, rarely acute. Stipitipellis composed of vertically arranged, branching, nearly colorless and hyaline, slightly thick-walled (ca. 0.5 µm thick), filamentous hyphae 3–15 µm broad. Caulocystidia ( Fig. 3e View FIGURE 3 ) 50–100 × 3–8 µm, numerous and crowded, evenly distributed, narrowly clavate to subcylindrical, thin- to slightly thick-walled (ca. 0.5 µm thick), often with a round apex, with dark brown to yellow-brown intracellular pigment, occasionally nearly colorless and hyaline, often incrusted with brown to yellow-brown substances. Chlamydospores not observed. Clamp connections abundant in every part of basidioma. Habitat and known distribution: fruiting in broad-leaved forests dominated by Fagaceae , on buried rotten wood; in summer at elev. 1000–2200 m in southwestern China and northern Japan.

Additional specimen examined: JAPAN. Tomakomai: Hokkaido, elev. 1000 m, on buried rotten wood, 13 September 2011, Zhu Liang Yang 5553 ( HKAS71038 !) .