Annual, appearing as sessile semicircular caps or rosettes 5–20 cm across, occurring singly or in small groups. Cap thickness varies on average from 1 to 6 cm. Caps more or less flat, with a small hump at the base. Surface white, often with scattered darker concentric bands in brownish, ochre, or olive shades (alternatively, white with a pinkish-brown margin), slightly pubescent. Fruit bodies may be covered with algae, acquiring a greenish tint. The cap margin is rounded in young specimens. With age, the pubescence is lost, the cap becomes smooth, creamy-ochre, and becomes overgrown (to a greater extent in the central part, though it can occur across nearly the entire surface) with epiphytic algae. The cap margin becomes sharper.
Tubes single-layered, occasionally 2–3-layered, white, sometimes yellowish, 5–15 mm long. Hymenophore surface white, creamy, or light straw-yellow; pores rectangular, elongated, radially arranged, appearing dotted, 1.5–5 mm long, 1–2 per mm in width, sometimes almost labyrinthine.
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