Generic short diagnoses:
A large, cushion-shaped operculate discomycete with narrowly attached apothecia, that touch the ground at the margin; underside with hyphal cords; spores with apiculate ornaments. On burnt soil near conifers (e.g. Pinus)
Species example:
Rhizina undulata - DK: rodmorkel UK: Pine Firefungus - young specimen
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.