Schiefelbein, U., Litterski, B. & Sipman, H. J. M. 2014. The contribution of Heinrich Gustav Flörke (1764–1835) to the exploration of the lichen flora of Mecklenburg-Western Pomerania. — Herzogia 27: 41–65.

We re-investigated those specimens from the exsiccata series “Deutsche Lichenen” issued by Flörke which the author also found in Mecklenburg-Western Pomerania (Germany), and the specimens collected by him within the current limits of this German federal state and deposited in the herbarium of the University of Rostock. Altogether 139 lichens and 8 lichenicolous fungi have been identified. Ramalina canariensis is new for Germany, and Acrocordia cavata, Graphis betulina, Lichenodiplis pertusariicola, Muellerella hospitans and Ramalina lacera are new for Mecklenburg-Western Pomerania. Flörke recorded 82 species for the first time in this federal state. A lectotype is selected for Stereocaulon incrustatum.