Spirogyra:

Spirogyra , a freshwater green algae known as 'water silk,' featuring spiral chloroplasts and multiple pyrenoids. Learn about their structure, reproduction, and role in aquatic ecosystems. Learn about Spirogyra , a free-floating green alga with spiral chloroplasts and unbranched filaments. Find out how Spirogyra reproduces by fragmentation, aplanospores, akinetes, zygospores and conjugation. Spirogyra are green, free-floating algae found in ponds, lakes, and other freshwater settings. Spirogyra are typically referred to as “water silk or pond silk.” They have a vegetative structure that is unbranched and filamentous. They are named for their aesthetically pleasing spiral chloroplasts. Spirogyra is a free-floating, freshwater, filamentous green alga of the class Chlorophyceae. It is usually found in stagnant water bodies such as ponds, pools, ditches, etc.