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May 1998 Hampshire. Photograph copyright Leif Goodwin
Top like, sometimes resembling a small tooth, upper surface smooth, underside slightly rough, whitish, to about 1.5cm across by 3cm high
Spring to summer
Singly, or gregariously, on woody debris in very wet places such as ditches and wheel ruts
Spores ellipsoidal to spindle shaped (8-15) x (3.5-5) µm2