Species:

Note: Ptilota gunneri Silva, Maggs & Irvine is distributed along the whole coast of Norway, and is a common epiphyte on kelp (Laminaria hyperborea) stipes. It has feather-like branching with long and short laterals borne alternately. It can be separated from Plumaria plumosa by having cortification of last order branches, whereas P. plumosa last order branches are uniseriate. P. gunneri can be separated from the northern P. serrata by having all laterals feathery branched; wheras P. serrata has spine-like short laterals.