Mercuriali-Fraxinetum is a ravine or scree forest dominated mostly by Acer pseudoplatanus, Fraxinus excelsior and Ulmus glabra. The shrub and herb layers are usually well developed and contain nutrient- and moisture-demanding species. In contrast, thermophilous species typical of ravine forests at lower altitudes are absent. This association occurs at mid-altitudes throughout the Czech Republic.