Metzgeria violacea (Ach.) Dumort.
Publication: Grolle, R. and So, M.L., 2003. Riccia fruticulosa OF Müll., 1782 and blue Metzgeria (Marchantiophyta) in Europe. Botanical journal of the Linnean society, 142(2), pp.229-235. 2003.
Metzgeria fruticulosa (Dicks.) Evans