Yellowing Oysterling Crepidotus luteolus (Lambotte) Sacc. (illustrated 90% life size) Cap 1–2.5cm across, kidney-shaped; white at first, becoming sulphur-yellow with age. Stem absent or rudimentary; at first sulphur-yellow, becoming white. Gills radiating from rudimentary stem; white at first, then flesh-coloured or more rusty. Spores 7.5–10(11)×3.5–5¼, brown, narrowly elliptical. Spore print clay-pink. Habitat on twigs of deciduous trees, often ash, and on stems of old nettles; autumn. Occasional. Not edible.