The start of a completely revised re-edition of Pascher’s famous “Siisswasserflora von Mitteleuropa” is a truly heroic enterprise in view of the fact that only a limited number of specialists do have the knowledge and experience to accomplish such a work. The first part consists in essence of Pascher’s classical monograph “Heterokonten” edited in Rabenhorst’s Kryptogamenflora in 1939, and completed with subsequently described taxa. Most illustrations and descriptions are derived from this monograph. Most later descriptions and illustrations, many of which borrowed from other work of Dr. Ettl, in style and presentation are similar and of equally high standard as those of Pascher, and clearly demonstrate Pascher’s profound influence on the eminent Czechoslovak school of phycologists.