Bay Polypore Polyporus durus (Timmerm.) Kreisel syn. P. badius (Pers.) Schwein. (illustrated 40% life size) Cap 5–20cm across, funnel-shaped, often lopsided and lobed; pallid grey-brown at first then chestnut, darker at centre; very thin, viscid when fresh, drying smooth and shiny. Stem 20–35×5–15mm, usually eccentric; black at least at base; taste bitter. Tubes 0.5–2.5mm long, decurrent; white, later cream. Pores 4–7 per mm, circular; white to cream. Spores 5–9×3–4¼, elongate-elliptical; white. Hyphal structure dimitic, with generative and binding hyphae; generative hyphae without clamps. Habitat on dead or living deciduous trees; spring to autumn. Frequent. Not edible.
