Generic short diagnoses:
Immersed discomycetes in pine cones or nettle stems, opening by lobes of host tisssue to expose white to grey discs; with cylindrical to filiform, 5- 8-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.