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}} ''Hedeia'' is a genus of early land plants of uncertain affinity. It comprises erect axes terminating in corymbose clusters of erect sporangia. Cookson gave no derivation of the generic name. The type species, ''H. corymbosa'', was first described by Isabel Cookson from a few specimens in fine sandstone from near Alexandra, Victoria, Australia. At the time, the locality was regarded as being of Silurian age, but it is now known to be Early Devonian. It is claimed that an undescribed species, also from Victoria, extends from the Early Devonian back to the Late Silurian.〔 ''H. parvula'' from Kazakhstan and ''H. sinica'' from China are also of Early Devonian age. It is sometimes suggested that ''Hedeia'' and ''Yarravia'' are merely different preservations of the same type of plant.〔See e.g. , p. 906.〕 ==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「Hedeia」の詳細全文を読む スポンサード リンク
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