The Permian was a period of transition in Antarctica as the glaciers of the Carboniferous and Early Permian retreated (Isbell, 2010), and the landscape became dominated by the plants of the Glossopteridales. The geographic range of the glossopterids extended across all of subequatorial Gondwana (McLoughlin, 2011). The group is identified with tongue-shaped leaves (genus Glossopteris) and is most often reconstructed as arborescent with Agathoxylon-type uniseriate coniferous wood. A distinctive rooting structure with conspicuous air spaces, Vertebraria, is found in association with the wood and leaf genera. These three genera are fairly conservative in...

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