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''Nostoc'' is a genus of cyanobacteria found in a variety of environmental niches that forms colonies composed of filaments of moniliform cells in a gelatinous sheath. The name ''Nostoc'' was coined by Paracelsus. It derives from the ancient Greek word "''nόsos''" (''νόσος'', "disease" or "sickness"). ''Nostoc'' can be found in soil, on moist rocks, at the bottom of lakes and springs (both fresh- and saltwater), and rarely in marine habitats. It may also grow symbiotically within the tissues of plants, such as the evolutionarily ancient angiosperm ''Gunnera'' and the hornworts (a group of bryophytes), providing nitrogen to its host through the action of terminally differentiated cells known as heterocysts. These bacteria contain photosynthetic pigments in their cytoplasm to perform photosynthesis. ==Species== ''Nostoc'' is a member of the family Nostocaceae of the order Hormogonales. Species include: *''N. azollae'' *''N. caeruleum'' *''N. carneum'' *''N. comminutum'' *''N. commune'', Koxianmi (Chinese) *''N. ellipsosporum'' *''N. flagelliforme'' *''N. linckia'' *''N. longstaffi'' *''N. microscopicum'' *''N. muscorum'' *''N. paludosum'' *''N. pruniforme'' *''N. punctiforme'' *''N. sphaericum'' *''N. sphaeroides'' *''N. spongiaeforme'' *''N. verrucosum'' 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「Nostoc」の詳細全文を読む スポンサード リンク
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