Keys to Plant Galls (Zoo- and Phytocecidia) of Central- and Northern Europe, with revised references to Clodomir Houard: Zoocecidia of Europe and of the Mediterranean Basin. In 1964-1965 Herbert Buhr published his ‘Bestimmungstabellen der Gallen (Zoo- und Phytocecidien) an Pflanzen Mittel- und…  Meer