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 Add this item to the list  831434 Original description
   
Remarks (public):F. yoroui differs from known species of Fulvifomes by the following combination of characteristics: Basidiocarp ungulate; Pileus projecting up to 6 cm, 8 cm wide and 4 cm thick at base, surface zoned, deeply cracked; fusoid cystidioles, 10–20 × 4–5 μm; Basidioles abundant, 6–8×4.5–7 μm; Basidiospores 5.3–6.5 × 4.5–5.8 µm, subglobose to globose. 
Description type:Original description 
Description:Fruitbody. Basidiocarp perennial, pileate, ungulate, solitary, woody hard and without odour or taste. Pileus projecting up to 6 cm, 8 cm wide and 4 cm thick at the base. Pileal surface dark reddish brown to black, glabrous, zoned, cracking irregularly and becoming fissured, with some areas may be covered by lichen thalli, margin brown, up to 2 mm wide. Pore surface dull brown, pores round, 6–7 per mm, dissepiments thin ca. 100 μm, entirely surrounding the pore. Context dark brown, darker than tubes, woody hard, up to 4 mm thick. Tubes woody hard, annual layers up to 3 mm long each. Hyphal structure. Hyphal system dimitic. Generative hyphae without clamp connections, skeletal hyphae dominant, IKI–, CB–. Context: Generative hyphae hyaline to pale yellowish, thin- to slightly thick-walled, occasionally branched, without clamp-connections, 1.7–3.5 µm in diam; skeletal hyphae dominant, brown, distinctly thick-walled, unbranched, 3–5.5 µm in diam. Tramal generative hyphae infrequent, hyaline to pale yellowish, thin- to slightly thick-walled, 2-2.5 μm in diam. Tramal skeletal hyphae dominant, brown, distinctly thick-walled, 3–4.5 μm in diam, unbranched. Setae absent. Cystidia absent. Cystidioles fusoid, 10–20×4–5 μm. Mature basidia not seen in the type material. Basidioles abundant, 6–8 × 4.5–7 μm. Spores. Basidiospores subglobose to globose, apiculus almost not visible in 1000x magnification, yellowish brown in water and dark brown (xantochoric) in KOH, thick-walled, smooth, IKI–, CB–, (5.0)5.3–6.5(6.6) × (4.3)4.5–5.8(5.9) µm, L = 5.97 μm, W = 5.18 μm, Q = 1.04–1.27 (n = 251/1). 
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