Fomitiporia triqueter Jian Chen, Yuan Yuan, K. Y. Luo, Y. C. Dai & Vlasák, 2025

Chen, Jian, Vlasák, Josef, Luo, Kai-Yue & Yuan, Yuan, 2025, Three new species of Fomitiporia (Hymenochaetales, Basidiomycota) from tropical dry forests in Ecuador and Peru, MycoKeys 118, pp. 267-287 : 267-287

Fomitiporia triqueter Jian Chen, Yuan Yuan, K. Y. Luo, Y. C. Dai & Vlasák sp. nov.

Figs 6 , 7

Diagnosis.

Fomitiporia triqueter is closely related to F. baccharidis and F. tabaquilio (Urcelay, Robledo & Rajchenb.) Decock & Robledo , and they all occur in South America. However, the latter two species differ from F. triqueter in having larger basidiospores (5.5–6.5 × 4.8–5.8 μm in F. baccharidis , 6–7.5 × 8–6.5 μm in F. tabaquilio , vs. 3.4–5.5 × 3.2–5.4 μm in F. triqueter ).

Holotype.

Ecuador • Macará , dry tropical forest, on the thick bark of a living angiosperm tree, 23.II.2024, leg J. Vlasák Jr., JV 2402/68 ( BJFC 053713 ).

Etymology.

Triqueter (Lat.) refers to the new species characterized by triqueter basidiomata in section.

Description.

Basidiomata biennial to perennial, but evidently short-living, pileate, without distinctive odor or taste when fresh, woody hard in consistency; pilei ungulate, triquetrous in section, projecting up to 4 cm, 2.5 cm wide, and 2 cm thick at base; pileal surface grayish dark, concentrically sulcate, glabrous, soon cracked and blackish with age; margin sharp; pore surface yellowish brown when fresh, becoming brown when dry; sterile margin yellowish brown, up to 100 µm wide; pores circular, 9–10 per mm; dissepiments slightly thick, entire. Context yellowish brown, woody hard, up to 2 mm thick; tubes yellowish brown, paler than pore surface, woody hard, up to 2 cm long, annual layers indistinct.

Hyphal structure. Hyphal system dimitic, generative hyphae simple septate; all hyphae IKI -, CB -; tissue becoming dark brown in KOH.

Context. Generative hyphae frequent, pale yellow, slightly thick-walled, occasionally branched, frequently septate, 2.5–3 µm in diam; skeletal hyphae dominant, yellowish brown, thick-walled, unbranched, more or less flexuous, interwoven, 3–4 µm in diam.

Tubes. Generative hyphae golden, slightly thick-walled, occasionally branched, frequently septate, 2.5–3.5 µm in diam; skeletal hyphae dominant, yellowish, thick-walled with a medium lumen, unbranched, more or less straight, parallel along the tubes, 3–4.5 µm in diam. Hymenial setae absent; cystidia and cystidioles absent; basidia subglobose to capitate, with four sterigmata and a simple septum at the base, 13–18 × 7–11 µm; basidioles dominant in hymenium, in shape similar to basidia, but slightly smaller; large rhomboid crystals present in the hymenium.

Basidiospores globose, hyaline, thick-walled, smooth, IKI [+], slightly CB +, (3.1 -) 3.4–5.5 (- 5.7) × (2.9 -) 3.2–5.4 (- 5.8) µm, L = 4.57 µm, W = 4.39 µm, Q = 1.04–1.05 (n = 60 / 2).

Type of rot. White rot in the bark; no signs of wood rot under the infested bark.

Additional specimen (paratype) examined.

Ecuador • Macará , dry tropical forest, on the thick bark of a living angiosperm tree, 21.II.2024, leg J. Vlasák Jr., JV 2402/36 ( BJFC 053712 ) .

Figures

Figure 6. Basidiomata of Fomitiporia triqueter (holotype, JV 2402 / 68). Scale bar: 1 cm.

Figure 7. Microscopic structures of Fomitiporia triqueter (holotype, JV 2402 / 68) a basidiospores b basidia and basidioles c hyphae from context d hyphae from the tube trama.