[in Swedish with English abstract: ] Oland’s windmills are an important habitat for several rare lichens. A total of 192 windmills out of 366 known on the island were visited and lichen flora investigated. The lichen flora found on this very special “culture wood” was before the study relatively unknown. 19 rare and culture wood-specific lichens was selected and mapped during the years 2017-2021. 248 findings of red-listed lichens were made and of the 178 windmills examined there were red-listed lichens on 140. Pycnora praestabilis is also reported as a new species to Oland.