Usually found in colonies of 4-16 cells. K. lunaris can be differentiated from other Kirchneriella by the strongly curved "half moon" shape and obtuse points. Individual cells average 3-8µ in diameter and 6-13µ long. An average colony can be 100-250µ in diameter. The colony above is entangled with Microactinium cells and other algae. Sample collected from Back River near Baltimore in June 2003.