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Nostoc commune : ウィキペディア英語版 | Nostoc commune
''Nostoc commune'' is a species of cyanobacterium in the family Nostocaceae. Common names include star jelly, witch's butter, mare's eggs, fah-tsai and facai. It is the type species of the genus ''Nostoc'' and is cosmopolitan in distribution. ==Description==
''Nostoc commune'' is a colonial species of cyanobacterium. It initially forms a small, hollow gelatinous globule which grows and becomes leathery, flattened and convoluted, forming a gelatinous mass with other colonies growing nearby. Inside the thin sheath are numerous unbranched hair-like structures called trichomes formed of short cells in a string. Cells have no nucleus nor internal membrane system. To multiply, they form two new cells when they divide by binary fission. Along the trichomes, larger specialist nitrogen-fixing cells called heterocysts occur between the ordinary cells. When wet, ''Nostoc commune'' is bluish-green, olive green or brown but in dry conditions it becomes an inconspicuous, crisp brownish mat.〔(【引用サイトリンク】title=''Nostoc'' )〕
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