Boletus badius Fr. syn. Xerocomus badius (Fr.) Kühn.Maronenröhrling Bolet bai, Cèpe des châtaigniers Bay Bolete Cap 4–14cm, bay to dark brick-colour later flushed ochraceous brown, downy when young, soon becoming smooth and polished, slightly viscid in wet weather. Stem 45–125 x 8–40mm, concolorous with cap or paler, surface slightly cottony. Flesh white to lemon-yellow on cutting becoming faintly blue particularly in stem apex and above tubes, vinaceous in cap. Taste and smell mild and mushroomy. Tubes cream to lemon-yellow, bruising bluish green. Pores large, readily bruising blue-green. Spore print olivaceous snuff-brown. Spores subfusiform, 13–15 x 4.5–5.5µ. Habitat in mixed woods. Season autumn. Common throughout British Isles. Edible – very good and usually free of maggots. Distribution, America and Europe.