Desmids are microscopic single-celled green algae with a typical symmetrical appearance. The cells are divided in two halves ('semicells') that are mirror images of each other and they show a remarkable variation in shape and ornamentation. Because desmids thrive in clear and nutrient poor freshwater, they gain increasing attention from ecologists for assessing and monitoring wetland areas.
Xanthidium cristatum var. uncinatum Ralfs Reference:Coesel & Meesters 2007 Remarks: The illustrated specimens have granules on the basic angles and belong to forma polonicum Grönblad.