Abstract
The relationships among western Eurasian and Macaronesian Cratoneuron filicinum (Hedw.) Spruce var. filicinum, C. filicinum var. atrovirens (Brid.) Ochyra, and C. curvicaule (Jur.) G.Roth were explored by ITS and the chloroplast markers rpl16 and tRNA-Gly. Haplotype networks, Jacknife, and Neighbour joining trees all provide high support for the recognition of C. curvicaule as distinct from C. filicinum, whereas the two varieties of the latter could not be distinguished. It is concluded that C. filicinum var. atrovirens most likely represents a phenotypic modification of C. filicinum that occurs especially in certain submerged environments or under heavily dripping water. The maximal support for the Cratoneuron clade and the small and quantitative morphological differences between its two species are arguments for not splitting this genus.
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