Pluteus chrysophlebius (Berk. & M.A. Curtis) Sacc., Syll. fung. (Abellini) 5: 678 (1887)

Qi, Zheng-Xiang, Qian, Ke-Qing, Yue, Lei, Wang, Li-Bo, Guo, Di-Zhe, Wu, Dong-Mei, Gao, Neng, Zhang, Bo & Li, Yu, 2024, New species, new records and common species of Pluteus sect. Celluloderma from northern China, MycoKeys 104, pp. 91-112 : 91

Pluteus chrysophlebius (Berk. & M.A. Curtis) Sacc., Syll. fung. (Abellini) 5: 678 (1887)

Figs 2E-F , 5

Agaricus chrysophlebius Berk. and M.A. Curtis 1859. Syn.

Description.

Basidiomata medium. Pileus 15-22 mm in diameter, surface not spreading, irregularly pitted, smooth, central part umbo, wrinkled or veined, yellow to bright yellow (5.0Y 9/12-5.0Y 9/20), with a hyaline stripe in the central part 3/4 of the way toward the margin, margin entire. Context yellowish (5.0Y 9/8), odor inconspicuous. Lamellae yellow to brownish yellow (5.0Y 9/6- 5.0Y 9/8), free, dense, thick, unequal, ventricose, 6-8 mm wide. Stipe 25-42 mm long, 4-6 mm wide, cylindrical, slightly thicker at the base, fibrous, bright yellow to yellow (5.0Y 9/10-5.0Y 9/18), smooth, with white tomentose dense cilia at the base. Odorless. Spore prints pink.

Basidiospores [90, 3, 1] 5.5-6.0 × (-4.5) 5.0-5.5 μm, avL × avW = 6.0 × 5.0 µm, Q = 1.09-1.20-1.33 μm, avQ = 1.20 μm, globose, subglobose, slightly pinkish, smooth, thinly walled, non-dextrinoid, partially containing one droplet or irregular inclusions. Basidia 23-34 × 7-11 μm, clavate, thin-walled, 4-sterigmate, and hyaline in KOH. Pleurocystidia scattered, 52-78 × 15-24 μm, broad and long-necked vase-like, partly with a long neck, neck with inclusions, thin-walled, smooth, and hyaline in KOH. Chilocystidia abundant, clustered, smaller, 45-66 × 14-21 μm, similar to pleurocystidia, long-necked vase-shaped to fusiform, thin-walled. Lamellar trama divergent. Pileipellis an euhymeniderm of spheropedunculate and subglobose elements 28-67 × 18-41 μm, with brown or light brown, at the center brown to dark brown. Stipitipellis a cutis, hyphae 5-9 μm wide, hyaline, non-gelatinous, thin-walled. Caulocystidia absent. Clamp connections absent in all tissues.

Ecology.

Solitary on decaying wood in mixed coniferous forests.

Distribution.

North America, South America.

Additional specimens examined.

China. Heilongjiang Province, Liangshui National Nature Reserve . 47°11'22.24"N, 128°47'89.11"E, 24 June 2019, D.Z. Guo, FJAU 66561 (ITS: OR994065, TEF1-α: PP062824) .

Note.

Pluteus chrysophlebius was first reported in China. It can be distinguished from other yellow-pileus species such as P. admirabilis (Peck) Peck, P. aurantiacus Murrill, P. melleus Murrill, and P. rugosidiscus Murrill by its yellowish pileus and stipe, as well as its bald pileus texture ( Minnis and Sundberg 2010; Malysheva et al. 2016). The phylogenetic analysis also supports the differentiation of species.

In the phylogenetic tree, P. chrysophlebius formed a cluster with TNSF12383 and TNSF12388 in Asia and was sister to SF10-SF12 in the United States, with strong support for both clades.

Figures

Figure 2. Basidiomata features A-B Pluteus brunneodiscus C-D P. cystidiosus E-F P. chrysophlebius G-I P. romellii. Photos by Zheng-xiang Qi (A-B, G-I). Photos by Di-zhe Guo (C-F). Scale bars: 1 cm.

Figure 5. A macroscopic characteristics of Pluteus chrysophlebius B basidiospores C basidia D pleurocystidia E cheilocystidia F pileipellis. Scale bars: 1 cm (A); 10 µm (B-G).