Ceratiomyxa Schroet.

Depending on ones species concept, there are one or two species in Denmark:

Ceratiomyxa fruticulosa (O.F. Müll.) T. Macbr.

Ceratiomyxa fruticulosa var. porioides (Alb. & Schwein.) G. Lister

The latter is often considered as an independent species.

 

Known distribution in Denmark of Ceratiomyxa fruticulosa (Müll.) Macbr. s.l.
The map is based on collections at the Botanical Museum, University of Copenhagen (C) until 1995.