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| image = | image_caption = | regnum = Plantae | divisio = Pteridophyta | classis = Equisetopsida | ordo = Pseudoborniales | familia = Pseudoborniaceae | genus = ''Pseudobornia'' | genus_authority = Nathorst. | species = ''P. ursina'' | binomial = ''Pseudobornia ursina'' † | binomial_authority = Nathorst. }} ''Pseudobornia'' is a genus of plants known only from fossils found from the Upper Devonian. It contains a single species ''Pseudobornia ursina'', and is the earliest fossil assigned with certainty to the Sphenopsida. The first fossils of ''Pseudobornia'' were collected by Johan Gunnar Andersson on Bear Island in the 1890s. Hans-Joachim Schweitzer, a paleobotanist, was the first to interpret the fossils as belonging to a large tree, based on additional fossils discovered in Alaska in the 1960s. The probable relationships within Equisetopsida are shown in the cladogram below. The position where ''Ibyka'' would be has been added.〔(【引用サイトリンク】url=http://www.ucmp.berkeley.edu/plants/sphenophyta/sphenophyta.html )〕 }} }} }} }} }} ==References== 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「Pseudobornia」の詳細全文を読む スポンサード リンク
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