CAP: 4-10mm in diameter. At first subglobose, ellipsoid or ovoid, then expanding to campanulate or convex before becoming finally flattened with a central depression.  The colour is off white with a furfuraceous to hairy-floccose texture.  The pellicle is gelatinous and separable. STIPE: Up to 27 mm long, fragile, terete, straight to curved. Pruinose with a somewhat hairy bulbous basal disc. GILLS: White at first but becoming cream with age.  14-30 gills reach the stipe and are ascending, narrowly adnate and sometimes form a pseudocollarium. FLESH:Thin and watery.  White with a weak nitrous odour. SPORES: 6-8.5µm x 3.5-4.5µm ellipsoid, smooth, hyaline, amyloid. HABITAT: Typically on decaying Knopper Galls on Quercus robur but can also be seen on fallen catkins on Alder and debris from Sweet Chestnuts and Hazels. SEASON: August to October. EDIBILITY: Inedible.