@article{SchaeferVerwimpGruber2002,
  author    = {Alfons Sch{\"a}fer-Verwimp and Johann Peter Gruber},
  title     = {Orthotrichum (Orthotrichaceae, Bryopsida) in Pakistan},
  journal   = {Tropical bryology},
  number    = {21},
  pages     = {1 -- 10},
  year      = {2002},
}