Although most modern palaeobotany textbooks cite the continuation of glossopterids into later parts of the Triassic and , in some cases into the Jurassic , these are mistakes based on misidentification of similar leaves such as those of Gontriglossa , Sagenopteris , or Mexiglossa . Although most modern palaeobotany textbooks cite the continuation of glossopterids into later parts of the Triassic and , in some cases into the Jurassic , these ranges are erroneous and are based on misidentification of morphologically similar leaves such as Gontriglossa , Sagenopteris , or Mexiglossa .