Chara is a genus of charophyte green algae in the family Characeae. They are multicellular and superficially resemble land plants because of stem-like and leaf-like structures. They are found in fresh water, particularly in limestone areas throughout the northern temperate zone, where they grow submerged, attached to the muddy bottom. They prefer less oxygenated and hard water and are not found in waters where mosquito larvae are present. They are covered with calcium carbonate deposits and are commonly known as stoneworts. Cyanobacteria have been found growing as epiphytes on the surfaces of Chara, where they may be involved in fixing nitrogen, which is important to plant nutrition.
Temporal range: Silurian–Recent
The branching system of Chara species is complex with branches derived from apical cells which cut off segments at the base to form nodal and internodal cells alternately. The main axes bear whorls of branches in a superficial resemblance to Equisetum. They are typically anchored to the littoral substrate by means of branching underground rhizoids. Chara plants are rough to the touch because of deposited calcium salts on the cell wall. The metabolic processes associated with this deposition often give Chara plants a distinctive and unpleasant smell of hydrogen sulfide.
The plant body is a gametophyte. It consists of a main axis (differentiated into nodes and internodes), dimorphic branches (long branch of unlimited growth and short branches of limited growth), rhizoids (multicellular with oblique septa) and stipulodes (needle shaped structures at the base of secondary laterals).
Chara reproduces vegetatively and sexually. Vegetative reproduction takes place by tubers, amylum stars and secondary protonema. The fructifications for sexual reproduction are globule or antheridium (male) and nucule or archegonium (female). The sex organs are multicellular and jacketed. The antheridia and archegonia may occur on separate plants (dioecy), together on the same plant (conjoined monoecy) or separately on the same plant (sejoined monoecy). After fertilization, the zygote develops into an oospore.
- Chara braunii (ITIS)
- Chara canescens (ITIS)
- Chara contraria (ITIS) opposite stonewort
- Chara corallina (ITIS)
- Chara elegans (ITIS)
- Chara excelsa (ITIS)
- Chara fibrosa (ITIS)
- Chara formosa (ITIS)
- Chara fragilis (ITIS)
- Chara globularis (ITIS)
- Chara hispida (ITIS)
- Chara hornemannii (ITIS)
- Chara intermedia (ITIS)
- Chara nataklys
- Chara sejuncta (ITIS)
- Chara virgata (ITIS)
- Chara vulgaris (ITIS)
- Chara zeylanica (ITIS)
- Chara connivens (convergent stonewort)
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Chara has a cosmopolitan distribution, from 69 degrees north in northern Norway to about 49 degrees south in Kerguelen Islands (Pal et al., 1962). About 27 species are found in India. There are about 40 species of Chara in Europe, where they are commonly found in the specific habitat-type designated as H3140 (hard oligo-mesotrophic waters with benthic vegetation of Chara spp h1) in the Natura 2000 plans of the European Union. Although this habitat is found all across Europe, it is threatened and to be protected and preserved.
The Netherlands are home to 20 species of Chara, growing in lakes and ponds of the habitat-type H3140. The H3140 habitats in the Netherlands, are considered important in the overall preservation efforts and therefore also for the Chara species in general.
Denmark. Here, many former Chara habitats (H3140) have been polluted by either toxins or excessive amounts of nutrients (in particular phosphates and nitrogen), but a few large lakes and ponds remain. Chara is found growing in the very clean hard water lakes of Thy National Park like Nors Sø for example. Tissø lake (fourth largest lake in Denmark) is also a H3140 habitat and contains Chara species.
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- H3140 - Hard oligo-mesotrophic waters with benthic vegetation of Chara spp h1. Archived December 27, 2013, at the Wayback Machine.
- 3140 Hard oligo-mesotrophic waters with benthic vegetation of Chara spp h1. Archived December 27, 2013, at the Wayback Machine. Danish Nature agency (in Danish)
- Natura 2000 basic analysis 2015-2021 for Hanstholm Reservatet, Hanstholm Knuden, Nors Sø and Vandet Sø Archived December 27, 2013, at the Wayback Machine. Danish Nature Agency 2013 (in Danish) ISBN 978-87-7091-034-7
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