Generic short diagnoses: Characteristic polypores, mostly associated with buried wood and with hymenophore of very irregularly shaped more or less angular to labyrinthoid pores; microscopically characterized i.e. by presence of gloeocystidia.
These pictures are part of the MycoKey project. You can use this link to view larger versions and more information in the MycoKey online version. You can also download and install the full MycoKey project to get thousands of pictures along with detailed generic descriptions, references and interactive, synoptical (multi-access) keys to genera of fungi in Northern Europe.