Boletus porosporus (Imler) Watling syn. Xerocomus porosporus Imler
Gefelderter Röhrling Sepia Bolete Cap up to 8cm, dark olive brown then sepia to cigar-brown although at first with yellow down which darkens on bruising, later cracking to show yellowish flesh particularly at centre. Stem 90–100 x 20–30mm, apex lemon-chrome sometimes with brown to blood-red zone, slightly ribbed with olivaceous brown, darkening when bruised. Flesh pale lemon yellow to buff in cap, stem apex lemon-chrome, stem base dark brick or vinaceous, finally becoming blue after cutting particularly above the tubes. Taste and smell not distinctive. Tubes lemon-yellow finally olivaceous, bruising blue. Pores compound, angular, lemon-yellow darkening with age, bruising blue. Spore print olivaceous snuff-brown. Spores subfusiform, 13–15 x 4.5–5.5µ, with a distinct truncate pore making this species unique among European boletes. Habitat mixed deciduous woods, particularly where oak is present. Season autumn. Rare. Edible but not recommended. Distribution, America and Europe.