Perenniporia ochroleuca  

Basidiocarps: perennial, pileate, pilei solitary or imbricate, sessile or attached with a narrow base, rather small, applanate, dimidiate or ungulate (hoof shaped), up to 7cm wide and 5 cm deep, 0.3-2.5 cm thick, corky when fresh, but woody hard when dry. Upper surface: glabrous, at first cream-ochraceous, with age discoloured, often zonate with pale yellowish brown to pale purplish brown. Margin: thick, rounded, entire or slightly lobed, usually light coloured, narrowly sterile. Pore surface: white, cream, or ochraceous to discoloured, pale brownish in older specimens. Pores: circular, 2-4 per mm. dissepiments (partitions between pores) thick and entire. Context: 1-3 mm thick, upper layer as a distinct horny cuticle, white to ochraceous, weakly zonate; tube layers single or weakly stratified, 3-10mm thick, straw to wood coloured. Hyphal system: trimitic. Basidia: 30-40 x 10-15 μm, barrel shaped, four spored, with a basal clamp. Spores: 12-17 (-20) x 7-10(-11) μm, abundant, ellipsoid, truncate at the apex, hyaline to golden yellow, thick walled, smooth, weakly to usually strongly dextrinoid in Melzer’s reagent.

Map of the known distribution in Great Britain and Ireland.

Description adapted from: L.  Ryvarden (2014) Synopsis Fungorum, Volume 31: Poroid Fungi of Europe