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Stigmaria
''Stigmaria'' are a type of branching tree root fossil found in Carboniferous rocks. They were the roots of coal forest lycopsid trees such as ''Sigillaria'' and ''Lepidodendron''. Each trunk tended to have four of those roots. ''Stigmaria'' is a form taxon, as the genus and species of the plant bearing the root is not identified.
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「Stigmaria」の詳細全文を読む
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