Generic short diagnoses:
An immersed discomycete in twigs of Vaccinium uliginosum, opening by a straight or forked slit to expose greyish to yellowish discs; with filiform, 0-septate spores.
The picture originates from the MycoKey 2.0 DVD. Here you will also find a larger picture along with a detailed generic description, references and an interactive, synoptical key to genera.