Pluteus longistriatus (Peck) Peck

Qi, Zheng-Xiang, Wang, Li-Bo, Qian, Ke-Qing, Shi, Li-Li, Hu, Jia-Jun, Tuo, Yong-Lan, Rao, Gu, Samwel Jacob, Muharagi, Liu, Rui-Peng, Liu, Ming-Hao, Guo, Di-Zhe, Liu, Ya-Jie, Zhang, Bo, Li, Xiao & Li, Yu, 2025, Integrating morphology, phylogeny, substrate, and distribution: clarifying the major phylogenetic framework of Pluteus sect. Hispidoderma (Agaricales, Pluteaceae) and describing 18 species, IMA Fungus 16, pp. e 154329-e 154329 : e154329-

Pluteus longistriatus (Peck) Peck , Ann. Rep. N. Y. St. Mus. nat. Hist. 38: 137 (1885)

Figs 6 K, L , 17

Description.

Basidiomata medium-sized. Pileus 31–35 mm diam; hemispherical to plano-convex, smooth, surface brownish-brown (5.0 YR 6 / 10), darker in the center (5.0 YR 4 / 10), with brown longitudinal striate extending from the middle to the margin. Lamellae dirty white (5.0 YR 9 / 4), free, relatively crowded, thick, unequal, slightly ventricose, 2–4 mm wide, with even edges. Stipe 26–31 × 3–5 mm, cylindrical, slightly thicker at the base, fibrous, with white longitudinal fibrils on the surface (5.0 YR 9 / 2). Odorless. Spore prints pink.

Basidiospores [60, 3, 1] (– 6.0) 6.5–7.0 (– 7.5) × 5.0–6.0 (– 6.5) μm, avL × avW = 6.7–7.0 × 5.8–6.1 µm, Q = 1.03–1.25 μm, avQ = 1.06–1.15 μm, globose to subglobose, or broadly ellipsoid, slightly pinkish, smooth, thin-walled or slightly thick. Basidia 25–31 × 9–11 μm, broadly rod-shaped or clavate, thin-walled, 4 - sterigmate, hyaline. Pleurocystidia 55–88 × 16–27 μm, numerous, scattered, fusiform or narrowly utriform, apically obtusely rounded, thin-walled, smooth, hyaline. Lamellar edge sterile. Cheilocystidia 41–76 × 18–25 μm, abundant, clustered, narrowly clavate to clavate or long clavate, thin-walled, hyaline. Pileipellis a hymeniderm, with terminal elements 60–114 × 19–28 μm, broadly clavate or fusiform, thin-walled, with brown intracellular pigment. Stipitipellis a cutis, hyphae 4–11 µm diam, cylindrical, hyaline, thin-walled. Caulocystidia 29–72 × 12–26 μm, numerous, occurring in clusters, clavate to oblong-clavate, or fusiform, apically obtuse or mucronate, hyaline, thin-walled. Clamp connections absent in all tissues.

Habitat.

Scattered on rotting wood in poplar forests ( Populus talassica ).

World distribution.

USA, Paraguay, Brazil, Argentina ( Justo et al. 2011 a; Ferisin and Dovana 2016; Campi et al. 2019), China ( Xu 2016).

China distribution.

Yunnan Province, Jilin Province ( Xu 2016).

Additional specimens examined.

CHINA • Jilin Province, Changchun City, Jilin Agricultural University . Scattered on rotting wood in poplar forests ( Populus talassica ); 42°17'66.65"N, 82°47'94.24"E, alt. 253 m, 10 July 2021, Z. X. Qi, Z. H. Zhang, FJAU 66596 (Collection no.: Qi 302) (ITS: PP 516605 , LSU: PP 516655 ) .

Notes.

Pluteus longistriatus is mainly characterized by a brown, smooth pileus with a distinctly brown and long radial stripe on the surface, extending from the center to the margin ( Ferisin and Dovana 2016; Campi et al. 2019).

P. longistriatus is similar to P. heteromarginatus in macromorphology, differing only in the shape of the pleuro, cheilo, and caulocystidia. P. longistriatus has pleurocystidia fusiform or narrowly utriform, apically obtusely rounded, cheilocystidia narrowly clavate to clavate or long clavate, and clavate to oblong-clavate, or fusiform caulocystidia. In contrast, P. heteromarginatus contains pleurocystidia with elongated apexes or an apical flexuous excrescence (5–10 µm long), cheilocystidia (narrowly) clavate, narrowly utriform, or more rarely obovoid, and fusiform or lageniform caulocystidia ( Justo et al. 2011 a). P. longistriatus is confused with P. atriavellaneus Murrill , which is characterized by the presence of brown pileus, with striped margins. On the other hand, the basidiospores of P. atriavellaneus are subglobose, slightly larger, and 7.0–8.0 μm in diameter ( Campi et al. 2019).

According to the phylogenetic analyses, P. longistriatus specimen FJAU 66596 from China clustered with specimens from Russia and South Korea with high support (MLB = 100, BPP = 1, Fig. 2 ).

Figures

Figure 2. Phylogenetic tree of the / plautus clade of the sect. Hispidoderma. The best tree from the ML and BI analysis of the ITS + tef 1 dataset. The two values of internal nodes respectively represent the Maximum Likelihood bootstrap (MLBP) / Bayesian posterior probability (BIPP). Nodes with a bootstrap probability (BP) ≥ 80 and a Bayesian posterior probability (PP) ≥ 0.80 are indicated in the phylogram. This study species is in bold and red font.

Figure 6. Basidiomata features. A, B. Pluteus albivillus (FJAU 66613). C – G. P. baishanzuensis (C, D. FJAU 66621, E – G. FJAU 66622). H – J. P. velutinus (H. FJAU 66619, I, J. FJAU 66620). K, L. P. longistriatus (FJAU 66596). A, B, K, L. Photos by Zheng-Xiang Qi. C – G. Photos by Rui-Peng Liu. H – J. Photos by Gu Rao. Scale bars: 1 cm.

Figure 17. A. Macroscopic characteristics of Pluteus longistriatus. B. Caulocystidia. C. Basidiospores. D. Pleurocystidia. E. Cheilocystidia. F. Pileipellis elements. Scale bars: 1 cm (A); 10 µm (C – E); 20 µm (B, F).