Two new Xeromphalina (Mycenaceae, Agaricales) species with eccentric stipes from subtropical China Author Liu, Li-Na Author Bau, Tolgor text Phytotaxa 2018 2018-12-04 379 4 277 286 http://dx.doi.org/10.11646/phytotaxa.379.4.1 journal article 10.11646/phytotaxa.379.4.1 1179-3163 13726402 Xeromphalina brevipes T. Bau & L N. Liu sp. nov. ( Figure 2 , 3 ) Mycobank No. MB828077 FIGURE 2. Basidiomata of Xeromphalina brevipes . Scale bar=5 mm; a. HMJAU47746; b. HMJAU47744. Photos by: Lina Liu Diagnosis:—Pileus convex to plano-convex, pale yellow to pale yellow-brown, paler towards striate margin, decurrent lamellae, yellow, short, eccentric or lateral stipe, basidiospores cylindrical, basidia 4-spored, cheilocystidia fusoid or lageniform, pleurocystidia absent, pileipellis turns orange-brown in KOH, subpileipellis turns pale brownish yellow to brown in KOH, circumcystidia coralloid, caulocystidia coralloid. Etymology:—referring to the short stipe Type:— CHINA . Anhui Province , Huangshan city, Huangshan Scenic Spot, 30°07′49″ N , 118°10′18″ E , 3 July 2018 , Tolgor Bau and Lina Liu, Voucher : HMJAU47744 ( Holotype !) Description:— Pileus 1–6 mm in diam., hemispherical to convex when young, expanding to plano-convex without depressed centre when old, hygrophanous, translucent-striate at margin, yellow-brown (5C7) at centre, pale yellow (5A3) to yellow-brown (5B3) towards striate margin, glabrous, darker and becoming rugose when dry. Lamellae decurrent with few lamellulae (L=15–24, I=1–2), moderately crowded, sometimes anastomosed, narrow, grey-yellow (4A2) to yellow (4A4), margins even. Stipe 2–5 × 0.5–1.2 mm , eccentric or lateral, almost cylindrical, yellow-brown (5C7), entirely pubescent, with slightly darker yellow-brown (5D7) basal tomentum. Context pale yellow (4A2). Smell and Taste indistinct. Rhizomorphs absent. Basidiospores 4.9–5.8 × 1.9–2.1 μm, Q = 2.0–2.7, amyloid, cylindrical, hyaline, thin-walled, smooth. Basidia 10–18 × 3–5 μm, 4-spored, narrowly clavate to subcylindrical. Lamellar edge heterogeneous, composed of scattered cheilocystidia mixed with basidia and basidioles. Cheilocystidia 17–27 × 3–7 μm, fusoid or lageniform, thin-walled, hyaline. Pleurocystidia absent. Pileitrama made up of cylindrical, sometimes inflated thin- to slightly thick-walled, 3– 8 μm wide hyphae, smooth or encrusted with brownish pigment which turns orange-brown in KOH. Pileipellis a cutis, made of parallel, cylindrical, slightly thick-walled, 2–9 μm wide hyphae, sometimes incrusted, with yellowish brown parietal pigment which turns orange-brown in KOH. Subpileipellis made up of parallel, 2–6 μm wide hyphae, with slightly encrusting yellowish brown pigment, which turns pale yellowish brown to brown in KOH. Circumcystidia abundant, 17–39 × 3–5 μm, cylindrical, with lateral projections or coralloid, thick-walled, orange-yellow-brown in KOH. Stipitipellis a cutis of parallel, cylindrical, thick-walled hyphae, with pale yellow or brown parietal pigment which turns brown or light brownish yellow in KOH. Caulocystidia 24–49 × 4–12 μm, clavate, cylindrical or utriform, sometimes with apical capitulum or one branch, irregular to subcoralloid, thick-walled, orange-brown or light brownish yellow in KOH. Clamp-connections present in all tissues. Habitat: Saprophytic; scattered or gregarious on decaying wood covered with mosses. Known distribution: Anhui Province , China Additional material examined: CHINA . Anhui Province , Huangshan city, Huangshan Scenic Spot, 30°07′49″ N , 118°10′18″ E , 4 July 2018 , Tolgor Bau and Lina Liu, Voucher : HMJAU47746.