Oudemansiella mucida (Schrad. ex Fr.) Kühn. syn. Armillaria mucida (Schrad. ex Fr.) Kummer Buchen-Schleimrühling, Collybie mucide Porcelain fungus. Cap 2–8cm across, convex then flattening, pale greyish when young becoming more white often with an ochraceous flush at the centre, semi-translucent, slimy. Stem 30–100×3–10mm, white striate above the membranous ring, slightly scaly below. Flesh thin, white. Cystidia thin-walled cylindric or utriform. Spore print white. Spores subglobose 13–18×12–15m. Cap cuticle hymeniform, of erect club-shaped cells. Habitat on the trunks of beech, often high up and in large clusters. Season late summer to late autumn. Common. Edible after washing to remove gluten. Found In Europe.