Entoloma conchatum Xiao L. He & E. Horak
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publication ID |
https://dx.doi.org/10.3897/mycokeys.61.46446 |
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persistent identifier |
https://treatment.plazi.org/id/E6291891-4395-5150-A871-63B321DDCF0B |
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treatment provided by |
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scientific name |
Entoloma conchatum Xiao L. He & E. Horak |
| status |
sp. nov. |
1. Entoloma conchatum Xiao L. He & E. Horak sp. nov. Figures 1a, b View Figure 1 , 2 View Figure 2
Type.
China. Sichuan Prov., Miyi County, Huangqiao reservoirs, ca. 1500 m elev., 26°42'-27°10'N, 101°41'-102°15'E, on soil, 13 September 2015, X.L. He (SAAS 1712, holotype; ZT 13628, isotype).
Sequences ex holotype.
KU312111 (ITS), KU534220 (nLSU), KU534459 (RPB2), KU534432 (mtSSU).
Etymology.
conchatum (Lat.), referring to the conchate shape of the basidiomes.
Diagnosis.
Entoloma conchatum closely resembles Entoloma parasiticum ( Quél.) Kreisel, described from Europe and N-America but differs by smaller basidiospores. The Australian C. viscosus is separated from E. conchatum by its sticky pileus and the absence of rhizoids at the base of the rudimentary stipe.
Pileus 7-15 mm, conchate, broadly convex, at first white, becoming orange-white, yellowish-white and finally pale pinkish in age, entirely matted-tomentose to matted-depressed fibrillose, opaque, dry, not hygrophanous, margin not transparent-striate. Lamellae with 2-4 tiers of lamellulae, adnexed, up to 2 mm wide, subventricose, subdistant, white at first, becoming pinkish in age, entire margin concolorous. Stipe 1-3 × 0.5-1 mm, lateral, strongly reduced, covered with minute, white fibrils, base with white mycelium. Rhizoids absent. Context white, thin, unchanging. Odour and taste not distinctive.
Basidiospores 8-10 (10.5) × (6) 6.5-8 μm (x = 9.0 ± 0.3 × 7.3 ± 0.3 μm), Q = 1.2-1.4, Q = 1.28 ± 0.03, 5-6-angled, heterodiametric in profile view. Basidia 28-34 × 9-12 µm, subclavate, 4-spored (also often 2-spored). Lamellar edge fertile. Cheilocystidia, pleurocystidia and caulocystidia absent. Pileipellis a cutis composed of cylindrical hyphae, terminal cells (25 –)35– 50 × 4-7 µm, cylindrical (or slender subclavate, weakly gelatinised wall thin, smooth or minutely encrusted with pale yellow pigment. Oleiferous hyphae numerous in pileipellis. Clamp-connections present in all tissues.
Habitat.
Amongst moss on stem base of living conifers and fallen branches of conifers ( Pinus sp., Picea sp.), or on roadside in conifers forest or broadleaf forest.
Additional materials examined.
China. Sichuan Prov., Miyi County, Huangqiao Reservoirs, ca. 1500 m elev., 26°42'N, 101°41'E, on soil, 13 September 2015, X.L. He (SAAS 1415); on fallen branches of conifers, 13 September 2015, X.L. He (SAAS 1117); X.L. He (SAAS 1378); amongst moss on stem base of living conifers, 13 September 2015, X.L. He (SAAS 1470); on soil, 13 September 2015, X.L. He (SAAS 1014; ZT 13609; SAAS 1364; ZT 13615). Yunnan Prov., Jinghong County, Dadugang, ca. 1200 m elev., 22°30'N, 101°45'E, on soil, 27 August 2011, X.L. He and M. Zhang (GDGM 28817).
Remarks.
Entoloma conchatum is characterised by basidiomes gradually changing colour from white to pinkish, matted-fibrillose pileus, 5-6-angled basidiospores and presence of clamp connections.
Macromorphologically (white fibrillose basidiomes), the following taxa resemble E. conchatum viz. E. crepidotoides W.Q. Deng & T.H. Li, recently described from tropical China, E. indocarneum Manim., Leelav. & Noordel. from India, E. exiguum Esteve-Rav. & M. de la Cruz, E. jahnii Wölfel & Winterh. and E. parasiticum from Europe, Claudopus minutoincanus Largent & Abell-Davis, E. pitereka Noordel. & G.M. Gates, C. rupestris Largent & Abell-Davis and C. viscosus Largent & Abell-Davis from Australia and, finally, C. pandanicola E. Horak from Papua New Guinea. However, E. jahnii , E. exiguum and E. parasiticum are readily distinguished by the much larger basidiospores (9.4-12 × 6.4-8.3 µm, 9.5-12.5 × 8-10.5 µm, 9.7-12.9 × 7.6-10.2 µm, respectively; Esteve-Raventos & De La Cruz 1998; Noordeloos 1992, 2004). Entoloma pitereka differs in the prominent basal rhizomorphs and larger basidiospores (8-12 × 6-8 µm, Noordeloos and Gates 2012); C. pandanicola is separated by the translucent striate pileus and smaller basidiospores (7-8 × 6.5-7.5 µm, Horak 1980). C. minutoincanus is different from E. conchatum in the sticky pileus and absence of clamp connections; C. rupestris is separated by the 4-5-angled and smaller basidiospores (6.5-9.2 × 6-8 µm) and absence of clamp connections; C. viscosus is distinctive by the presence of rhizoids and absence of clamp connections ( Largent et al. 2011). The only white Claudopus species recently described from tropical China, E. crepidotoides , is recognised by the smaller basidiospores (8-9 × 6-7 µm, Deng et al. 2015). E. indocarneum (as E. carneum Manim., Leelav. & Noordel. in Manimohan et al. 2002) is readily distinguished from E. conchatum by its smooth pileus, presence of mycelial rhizoids and narrower basidiospores (7.5-10 × 5-7 µm, Manimohan et al. 2002).
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