Chara is a form of algae that grows attached to the bottom of a pond. It can cover large areas and be several inches thick. The stems are hollow and are a yellow-green color. Leaf-like projections occur in whirls around the stem. When the stems are crushed they may feel gritty due to mineral deposits and will release a distinctive musky odor. It is important that this algae not be confused with higher plants (aquatic weeds). Chara has been successfully treated using copper based products and alkylamine salts of endothall.
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