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| image = CharaFragilis.jpg | image_caption = ''Chara globularis'' | regnum = Plantae | divisio = Charophyta | classis = Charophyceae | ordo = Charales | familia = Characeae | genus = ''Chara'' | genus_authority = L., 1753 | subdivision_ranks = Species | subdivision = See text }} ''Chara'' is a genus of 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. 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.〔Sims, G. K. and Dunigan, E. P. 1984 Diurnal and seasonal variations in nitrogenase activity (C2H2 reduction) of rice roots. Soil Biology and Biochemistry. 16:15-18.〕 == Structure == 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. 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.〔F.E.Round. 1966. ''The Biology of the algae.'' Ernest Arnold.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chara (alga)」の詳細全文を読む スポンサード リンク
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