@misc{Frahm2012,
  author    = {Jan-Peter Frahm},
  title     = {Protonemabl{\"a}tter von Tetraphis pellucida},
  booktitle = {128},
  series    = {Archive for Bryology},
  number    = {128},
  type      = {periodicalpart},
  pages     = {5},
  year        = {2012},
}