Fulvifomes bolivianus Jian Chen, Yuan Yuan, K. Y. Luo, Y. C. Dai & Vlasák, 2025

Chen, Jian, Yuan, Yuan, Luo, Kai-Yue & Vlasák, Josef, 2025, Two new species of Fulvifomes (Hymenochaetales, Basidiomycota) from South America, MycoKeys 119, pp. 263-279 : 263-279

Fulvifomes bolivianus Jian Chen, Yuan Yuan, K. Y. Luo, Y. C. Dai & Vlasák sp. nov.

Figs 2 , 3

Diagnosis.

Fulvifomes bolivianus is related to F. squamosus Salvador-Montoya & Drechsler-Santos , but F. squamosus differs from F. bolivianus by applanate to triquetrous pilei, a monomitic hyphal system in context, and larger pores (5–6 per mm vs. 7–8 per mm).

Holotype.

Bolivia. • St. Cruz Dept., Refugio los Volcanes , altitude 1100 m, dead angiosperm tree, 1.XI.2023, leg J. Vlasák Jr., JV 2311/6-J ( BJFC 044745 ).

Etymology.

Bolivianus (Lat.): refers to the type of species being found in Bolivia.

Description.

Basidiomata perennial, pileate, solitary, without distinctive odor or taste, and woody hard when fresh, light in weight when dry. Pilei ungulate, projecting up to 11 cm and 5 cm wide and 2.5 cm thick at base. Pileal surface olivaceous when dry, encrusted, rough, concentrically sulcate, irregularly cracked; pileal margin brown, obtuse. Pore surface umber, with a reddish tint, unglancing; sterile margin distinct, fulvous, up to 3 mm wide; pores circular, 7–8 per mm; dissepiments thick, entire. Context umber, woody hard, zonate, up to 5 mm thick. Tubes fulvous, woody hard, up to 1 mm long, tube layers indistinctly stratified.

Hyphal structure.

Hyphal system dimitic in trama and context; generative hyphae simple septate; tissue becoming blackish brown in KOH.

Context.

Generative hyphae hyaline to brown, thick-walled, unbranched, simple septate, 2–2.5 µm in diameter; skeletal hyphae dominant, golden yellow to brown, thick-walled, unbranched, aseptate, more or less straight, regularly arranged, 4–6.5 µm in diameter.

Tubes.

Generative hyphae hyaline to brown, thick-walled, unbranched, simple septate, 2–3 µm in diameter; skeletal hyphae frequent, golden yellow to brown, thick-walled with a narrow lumen, unbranched, aseptate, more or less straight, subparallel along tubes, 2.5–4 µm in diameter. Setae or setal hyphae absent; cystidioles thin-walled, hyaline, varies in shape, fusoid to ventricose with elongated apical portion, 8.5–18 × 3.5–5.5 μm; basidia clavate to barrel-shaped, with four sterigmata and a simple basal septum, 15–18 × 6–7 µm; basidioles in shape similar to basidia, slightly smaller than basidia.

Basidiospores subglobose, yellowish brown, thick-walled, smooth, IKI –, CB –, (4.4 –) 4.7–5.4 (– 5.7) × (3.5 –) 4–5 (– 5.3) µm, L = 5.04 µm, W = 4.50 µm, Q = 1.12 (n = 30 / 1).

Type of rot.

White rot.

Additional specimen examined

(paratype). Bolivia. • St. Cruz Dept., Refugio los Volcanes , altitude 1100 M, dead angiosperm tree, 1.XI.2024, leg J. Vlasák Jr., JV 2411/15 J .

Figures

Figure 2. Basidiomata of Fulvifomes bolivianus (a. Holotype, JV 2311 / 6 - J; b. Paratype JV 2411 / 15 J).

Figure 3. Microscopic structures of Fulvifomes bolivianus (Holotype, JV 2311 / 6 - J). a. Basidiospores; b. Basidia and basidioles; c. Cystidioles; d. Hyphae from context; e. Hyphae from tube trama.