Entoloma wuyishanense J. Q. Yan, L. G. Chen & S. N. Wang, 2025

Chen, Lin-Gen, Chen, Hong, Ding, Ling, Xu, Yu-Qin, Zeng, Hui, Wang, Sheng-Nan & Yan, Jun-Qing, 2025, Four new species of Entoloma subgenus Cyanula (Entolomataceae, Agaricales) from subtropical regions of China, MycoKeys 116, pp. 303-325 : 303-325

Entoloma wuyishanense J. Q. Yan, L. G. Chen & S. N. Wang sp. nov.

Fig. 5

Etymology.

Refers to the collection locality of the holotype specimen – Wuyishan National Natural Park.

Holotype.

China • Fujian Province, Nanping City, Wuyishan National Natural Park , 27.5418°N, 117.4743°E, alt. 422 m, 7 June 2022, collected by Jun-Qing Yan and Lin-Gen Chen, HFJAU 3571 .

Diagnosis.

Entoloma wuyishanense is mainly characterized by the rather small and blue basidiomata, squamous and striate pileus, white and adnexed lamellae with fertile edge with slightly bluish pigmentation near the stipe, relatively large basidiospores with 5–6 angles, pileipellis with fuscous intracellular pigment. It differs from E. azureosquamulosum Xiao L. He & T. H. Li by the striate pileus, adnexed lamellae, larger basidiospores, and fertile lamellae edge.

Macromorphology.

Basidiomata rather small. Pileus 2.0– 11 mm wide, conical when young, then convex to flattened with depressed center, with entire, straight or wavy margin, not hygrophanous, squamous with denser center, translucently striate almost up to the center, deep blue (20 E 4–7) to light gray-blue (20 B 2–3), darker at center. Lamellae moderately distant, 1.0–3.0 mm wide, with two types of lamellulae, adnexed, ventricose, white, with entire and bluish edge near the stipe. Stipe 9.0–26 × 1.0–2.0 mm, central, terete, equal, hollow, concolorous with pileus, paler downwards, white fibrillose, glabrescent with age, base with white mycelium. Context thin, gray-blue. Odor indistinct, taste not tested.

Micromorphology.

Basidiospores (9.5) 10–13.5 (15) × (6.5) 7.5–9.5 (10) μm, (av = 11.7 × 8.5 μm), Q = 1.2–1.7 (2.0) (Qm = 1.4 ± 0.11, n = 200), heterodiametrical, 5–6 angles in profile view, sometimes appearing nodulose, thick-walled, inamyloid. Basidia 25–33 × 10–13 μm, clavate, slightly constricted at middle, 4 - or 2 - spored, sterigmata 6.0–10 μm long, clampless. Lamellae edge fertile. Cystidia absent. Lamellar trama regular, made up of cylindrical hyphae 5.0–11 µm wide. Pileipellis a trichoderm made up of clavate to pyriform terminal cells, 41–65 × 22–36 μm. Pigment fuscous, intracellular, diffuse in pileipellis. Stipitipellis a cutis composed of densely arranged, cylindrical hyphae, 5.0–12 μm wide, with rounded end. Clamp connections absent.

Habitat.

Solitary or scattered on moss in mixed coniferous-broad-leaved forest.

Distribution.

So far known from eastern China.

Additional specimens examined.

China • Zhejiang Province, Lishui City, Songyang County, Zicao Village , 28.4874°N, 119.5783°E, alt. 722 m, 2 July 2022, collected by Jun-Qing Yan, Cheng-Feng Nie, and Meng-Hui Han, HFJAU 3871 , HFJAU 3874 , HFJAU 3878 • Lishui City, Yunhe County, Chongtou Town, Xiayang Village , 28.0499°N, 119.4732°E, alt. 592 m, 4 July 2022, collected by Jun-Qing Yan and Cheng-Feng Nie, HFJAU 3881 .

Notes.

Morphologically, E. azureosquamulosum is the most similar species with the distinction that E. azureosquamulosum exhibits not striate pileus, adnate lamellae, smaller basidiospores (8–10.5 × 6.5–8.0 μm), and sterile lamellae edge ( He et al. 2012).

In the phylogenetic tree, E. wuyishanense belongs to Cyanula sect. Poliopodes , within which several species have blue pileus, including E. argus O. V. Morozova, E. S. Popov, A. V. Alexandrova & Noordel. , E. calceus Noordel., Bendiksen, Brandrud, P. - A. Moreau & Vila , E. corvinum (Kühner) Noordel. , E. icarus O. V. Morozova, E. S. Popov & Noordel. , and E. perchalybeum Noordel., J. B. Jordal & Dima. However , the lamellae edge of the latter in all species is sterile. In addition, E. argus is characterized by the adnate lamellae and smaller basidiospores (≤ 10 μm) ( Morozova et al. 2022); E. calceus shows 6–9 angled basidiospores ( Noordeloos et al. 2022 b); E. corvinum is recognized by its not striate pileus, adnate lamellae, and smaller basidiospores (8.0–11 × 6.5–7.5 μm) ( Noordeloos 1982); E. icarus can be easily differentiated by the lateral stipe and adnate lamellae ( Morozova et al. 2022); E. perchalybeum is distinct by the adnate lamellae and 6–7 rather bluntly angled basidiospores ( Noordeloos et al. 2022 b).

Figures

Figure 5. E. wuyishanense A – C basidiomata HFJAU 3571, holotype B, C HFJAU 3871 D basidiospores E, F pileipellis G basidia H fertile lamellar edge. E was observed in H 2 O D, F – H were observed in 5 % KOH, and used 1 % Congo red as the stain except D. Scale bars: 10 mm (A – C); 20 μm (D); 30 μm (E – H).