Buchwaldoboletus lignicola (Kallenb.) Pilát

Zhang, Xu, Li, Xin-Ni, Liang, Wei-Qing, Mu, Xiao-Dong, Yu, Ye-Fei, Wu, Xiao-Jun, Chen, Si-Yu, Pu, Jin-Bao & Zeng, Nian-Kai, 2025, The subfamily Chalciporoideae (Boletaceae, Boletales) in China, MycoKeys 124, pp. 123-157 : 123-157

Buchwaldoboletus lignicola (Kallenb.) Pilát , Friesia. 9 (1–2): 217, 1969

Figs 2 a, b , 3

Boletus lignicola Kallenb. , Die Pilze Mitteleuropas, Band 1, Die Röhrlinge (Boletaceae): 57, 1929.

Xerocomus lignicola (Kallenb.) Singer , Annales Mycologici 40: 43, 1942.

Phlebopus lignicola (Kallenb.) M. M. Moser ex Groves , Mycologia 54: 320, 1962.

Pulveroboletus lignicola (Kallenb.) E. A. Dick & Snell , Mycologia 57: 451, 1965.

Gyrodon lignicola (Kallenb.) Heinem. , Bulletin du Jardin Botanique de l’État à Bruxelles 21: 238, 1951.

Description.

Basidiomata small-sized. Pileus 3–4 cm in diameter, subhemispherical to convex; surface dry, finely tomentose, orangish-yellow to golden-yellow (4 A 6–5 A 7); context 0.4–0.6 cm in thickness in the center of the pileus, white (1 A 1) to yellowish (1 A 2), unchanging in color when bruised. Hymenophore poroid, slightly decurrent; pores angular to roundish, yellow, changing greenish-blue when bruised; tubes 0.1–0.3 cm long, yellow, changing greenish-blue when bruised. Stipe 3–5 × 1–2 cm, central, solid, subcylindrical, surface tomentose, upper part pale yellow to yellow (3 A 4–3 A 5), lower part orangish-brown to ochre (5 C 5–6 C 6); context white (1 A 1) to yellowish (1 A 2), unchanging in color when bruised; basal mycelium white. Odor indistinct. Taste mild.

Basidiospores [40 / 2 / 1] (6) 6.5–9 × (3) 3.5–4 μm, Q = (1.5) 1.75–3.0, Qm = 2.30 ± 0.32, yellowish brown in KOH, elongated to cylindrical, slightly thick-walled (0.8–1 µm), smooth under the light microscope. Basidia 14–29 × 5–8 μm, clavate, slightly thick-walled (up to 1 µm), 4 - spored, hyaline to pale yellow in KOH; sterigmata 2–5 μm in length. Cystidia 20–35 × 5–7 μm, fusiform or subfusiform, slightly thick-walled (up to 1 μm), pale yellow in KOH. Hymenophoral trama boletoid, colorless to yellowish in KOH, thin- to slightly thick-walled (up to 0.5 μm), 6–12 μm wide. Pileipellis an intricate trichoderm 400–550 μm in thickness, composed of hyaline to pale yellow in KOH, slightly thick-walled (up to 1 μm) hyphae; terminal cells 9–37 × 3–7 μm, clavate to subcylindrical or cystidioid. Pileus trama made up of hyphae 2–9 μm in diameter, thick-walled (up to 1.5 μm), yellow in KOH. Stipitipellis a trichoderm-like structure 160–200 μm thick, composed of pale yellow in KOH, thin-walled hyphae; terminal cells 18–27 × 5–8 μm, clavate or subcylindrical. Stipe trama composed of parallel hyphae 2–16 μm in diameter, cylindrical, thin-walled, yellow in KOH. Clamp connections absent in all tissues.

Habitat.

Solitary on the ground in broadleaf forest.

Known distribution.

Southern ( Hainan Province) and northeastern China ( Heilongjiang Province); Europe, North America, Nepal, Korea, and Indonesia ( Kallenbach 1929; Aryal and Budathoki 2013; Wu et al. 2016; Venturella 2017; Jo et al. 2019; Putra et al. 2025).

Material examined.

China • Hainan Province, Changjiang County, Bawangling of Hainan Tropical Rainforest National Park , elev. 650 m, 2 September 2020, N. K. Zeng 4946 ( FHMU 5579 ) .

Notes.

Buchwaldoboletus lignicola was originally described from Germany by Kallenbach (1929). In China, it was reported from the northeastern region of the country ( Wu et al. 2016). In the present study, it was also found to be distributed in Hainan Province, southern China. The species is characterized by a dry, tomentose, orangish-yellow to golden-yellow pileus, a yellow hymenophore bruising greenish-blue, and an intricate trichodermal pileipellis. Based on our specimen, a diagnostic feature described by Wu et al. (2016), viz., doliform to subglobose cells often forming chains in the pileipellis, was not observed. Such cellular morphology has not been reported in other recent descriptions of B. lignicola , including specimens from Korea ( Jo et al. 2019).

Figures

Figure 2. Basidiomata of fungi in the subfamily Chalciporoideae a, b. Buchwaldoboletus lignicola (FHMU 5579); c – e. Chalciporus aurantiolepidotus (c, e FHMU 7049, holotype; d FHMU 7472); f – h. C. brunneus (FHMU 8246, holotype); i. C. hainanensis (FHMU 9951); j – l. C. roseus (FHMU 7888, holotype); m – o. Pseudophylloporus castaneus (ZJMR 330727230331, holotype). Scale bars: 1 cm. a – l. photos by N. K. Zeng; m – o. photos by J. B. Pu.

Figure 3. Microscopic features of Buchwaldoboletus lignicola (FHMU 5579). a. Basidia; b. Basidiospores; c. Cystidia; d. Pileipellis; e. Stipitipellis. Scale bars: 10 µm. Drawings by X. N. Li.