Staurastrum glaronense, a rare species in Austria In July 2023, a peculiar Staurastrum (circa 20x20 um) was found in sample material from a small mountain lake (12 x 4 meters) at an altitude of 2350 meters. Initially this species could not be identified, even after consulting various experts. A few months later, and with the help of SEM photos, it became clear that it had to be Staurastrum glaronense. This species was first found in Switzerland in 1951 and described by Messikommer.