Oscillatoria with separation disk

Oscillatoria is a type of blue-green algae commonly found in freshwater, including hot springs. This unbranched, thread-like alga can appear alone or in tangled mats. It gets its name from its slow, rhythmic movement. It reproduces by breaking into pieces, where dead concave cells act as separation points, called separation disks, creating new filaments called hormogonia. Towards the tip of this Oscillatoria a separation disk is visible.