What does chara mean?
Chara is a genus of branched green algae commonly called stoneworts or brittleworts, found submerged in fresh water throughout much of the world. Though simple organisms without true roots, stems, or leaves, they have a plant-like architecture: slender main axes bear regular whorls of short branchlets, giving them a superficial resemblance to miniature horsetails. A distinctive feature is their tendency to become encrusted with calcium carbonate, making the plants rough, brittle, and sometimes almost stony to the touch — hence their common names. Because many species favour hard, alkaline water and help bind sediment while absorbing nutrients, ecologists often regard abundant Chara growth as an indicator of clear, good-quality water, and restoration projects sometimes deliberately reintroduce it to lakes and ponds. The word appears chiefly in botanical and environmental contexts, usually italicized as a formal genus name.
nounA genus of branched green algae (stoneworts) that grows submerged in fresh, often calcium-rich water, characterized by whorls of branchlets and a crusty, lime-encrusted texture.
- A genus of branched freshwater green algae known as stoneworts or brittleworts, whose stem-like axes bear whorls of branchlets and are often coated with lime deposits.
"The pond's clarity was largely due to the dense meadows of Chara growing across its bed."
"Ecologists recorded extensive beds of Chara along the lake's shallow margins."
"Because Chara thrives in hard water, its presence is often taken as a sign of good water quality."
As a mass noun referring to the algae collectively, it is often left uninflected; when individual plants are counted, 'charas' is used.
"Several charas were collected from the shallows for examination."
Despite being little more than a pond weed, Chara can feel almost woody to the touch — its stems become so encrusted with calcium carbonate that they crunch when crushed.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chara
The genus name Chara derives from Greek khará, meaning 'joy' or 'delight'. It belongs to the same broad Indo-European root that produced the Greek stem khar- seen in words such as charisma and eucharist, which entered English through Latin and ecclesiastical Greek. As a botanical name it was established in early modern taxonomy for these lime-crusted freshwater algae.
How chara is actually used
In scientific writing the genus name is capitalized and italicized (Chara); in general prose it may appear lowercase. The word is technical, encountered mainly in botany, ecology, and limnology rather than everyday speech.
Easily confused with chara
A chakra is an energy centre in Hindu and yogic tradition, whereas chara is a genus of aquatic green algae.