Proxy for seed surface (length x width) organised in ascending order with the superimposed polynomial function describing it (n=263).

 
 
  Part of: Van Waveren IM (2019) A morphometric analysis of Tobleria bicuspis, a Voltziales seed cone from the early Permian Jambi palaeoflora, Sumatra (Indonesia). PhytoKeys 119: 67-95. https://doi.org/10.3897/phytokeys.119.29555