Crepidotus striatus T. Bau & Y.P. Ge
MycoBank number: MB830020
Pileus 8.0–17.0(–23.0) mm, when young white, ungulate to petaloid, viscid, margin with inconspicuous striae, at maturity white to whitish, pale cinnamon-pink, flabelliform to semicircular, convex, obviously striate, not hygrophanous, when old almost straight, convex at the attachment. Lamellar 1.5–2.5mm broad, L= 7–12, l=3–7, when young white, at maturity whitish to tawny, ventricose, decurrent. Stipe rudimentary, whitish, translucent, cylindrical, at maturity short cylindrical to globose, tomentose. Context thin, translucent, odour and taste not distinctive. Basidiospores (6.7–)7.1–8.0(–8.5) × 4.6– 5.4(–5.7) μm, Q = (1.33–)1.39–1.64[ x =7.75.1μm, Qm=1.50], ellipsoid to slightly fusoid in frontal view, light brown to tawny, smooth under oil and SEM, with no hilar appendix. Basidia 18–24×6.0–7.6μm, mostly 2-spored, rarely 4-spored, slightly cylindrical to clavate, hyaline. Pleurocystidia absent. Cheilocystidia 25–41×8–14μm, conical to cystic, abundant when young, at maturity mostly collapsed. Lamellar edge with 37–80μm gelatinous layer, cheilocystidia mounted in it. Pileipellis a cutis, composed of parallel 4.3–5.7μm broad cylindrical hyphae, branched occasionally,
sometimes the branched hyphae up to 20μm long, a few pileocystidia-like, with a 50–120μm gelatinous layer. Clamp connections absent.
Habitat: Gregarious on decaying broad-leaved wood.
Additional material examined: CHINA. Guangxi Zhuang Autonomous Region: Nanjing City, Liangfengjiang National Forest Park, 16 Aug 2016, 22°43.24′N, 108°29.21′E, Yupeng Ge, Junqing Yan, HMJAU37076, HMJAU37077; Wuming County, Nanning City, Gaofeng Forestry Station, 23°13.63′N, 108°16.13′E HMJAU37087, HMJAU37093. Fujian Province: Wuyishan City, Huang Village, Shiyuanlong, 13 Aug 2015, Yupeng Ge, Tolgor Bau, Junqing Yan, HMJAU37050, HMJAU37052; Wuyishan City, Yulinyao, 14 Aug 2015, Yupeng Ge, Tolgor Bau, Junqing Yan, HMJAU37061. Zhejiang Province: Qingyuan County, Lishui City, Wulingkeng, 16 Aug 2015, Yupeng Ge, Tolgor Bau, Junqing Yan, HMJAU37063. Anhui Province: Luan City, Mazongling Jinzhai Town, 21 Aug 2015, Yupeng Ge, Junqing Yan, HMJAU37068 (HMJAU).
Note: In the taxonomic view of Hesler & Smith (1965), five species and three varieties were included in sect. Crepidotus and the gelatinous thickness of the lamellar edge was described in detail. Amongst the species classified in sect. Crepidotus, only C. uber, which lacks a gelatinous lamellar edge, resembles C. striatus because of the thick-walled and lageniform cheilocystidia. However, C. uber differs in the non-gelatinous lamellar edge and pileus. These characters were also noted by Han et al. (2004). The habitat could be used as a distinguishing character. Crepidotus striatus is generally found in the humid tropics and grows in clusters with 3–10 basidiomata in southern China, whereas C. uber grows gregariously in the northern temperate region.
Fig. 1 RAxML tree and phylogenetic relationships of Crepidotus. Inocybe species were served as outgroup. Maximum likelihood support values (>50%) and posterior probabilities (>0.80) are showed on main branches (ML/PP).
Fig. 2 Microscopic features of Crepidotus striatus (HMJAU 37076). a: Basidiomata; b: Basidiospores; c: Basidia; d: Pileipellis; e: Cheilocystidia; f: Lamellae edge. Bars: a=10mm; b=5μm; c–f=10μm.