This work covers the taxonomy of Klebsormidium species occuring in Western and Central Europe.| In several aspects,the green algal genus Klebsormidium (formerly known as Hormidium) is an important member of charophycean algae. The species play an important role in all kinds of moist terrestrial ecosystems. In addition, the Charophyceae including Klebsormidium are presumed to be closely related to the ancestry of higher land plants.