@misc{KalbSchumm2021,
  author    = {Klaus Kalb and Felix Schumm},
  title     = {New or otherwise interesting lichens. IX. Four new species in the family Graphidaceae, one new combination, new records and remarks},
  booktitle = {Archive for lichenology ; 22},
  issn      = {1868-4173},
  series    = {Archive for lichenology},
  number    = {22},
  type      = {workingpaper},
  pages     = {22},
  year        = {2021},
}