the common smoothcap moss (atrichum undulatum) features transversely undulate leaves, but its most prominent feature are the long, distinctly beaked capsules that are borne on 3 cm long, reddish setae.
the species is also called catherine’s moss in english, and wellenblättriges katharinenmoos in german.
species details via Farbatlas Flechten und Moose (Wirth, Düll)