Rhizocarpon Ram. em. Th. Fr. Subgen. Rhizocarpon in Europe

Abstract
Failure to accurately identify the lichen species used in lichenometry is a serious potential source of dating error. This paper provides a dichotomous key to the thirty-seven species of Rhizocarpon subgenus Rhizocarpon currently recognized in Europe; eighteen of these species have also been reported from North America. The key is presented in the hope that it will encourage greater taxonomic precision among lichenometrists (Translator).

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