The taxonomic status of the neotropical Platyhypnidium aquaticum (A. Jaeger) M. Fleisch. (Brachytheciaceae, Bryopsida) based on ITS sequence data
Wagner, Dorothea; Stech, Michael Kürschner
Systematic relationships of the closely related aquatic mosses Platyhypnidium aquaticum, P. mutatum, and P. riparioides are evaluated based on sequences of the ITS1 and ITS2 of the nuclear ribosomal DNA. In molecular trees based on maximum parsimony and maximum likelihood, P. riparioides and P. mutatum form one clade with 99-100% bootstrap support, whereas P. aquaticum is separated from these species. The molecular data therefore indicate that P. aquaticum is not conspecific with P. riparioides and should be treated as a separate species. Both parsimony and likelihood trees indicate that Platyhypnidium is not monophyletic, as Rhynchostegium is nested within the Platyhypnidium clade.