Histogram for the proxy for scale surface (length x width) distribution compared to the normal distribution curve (n=158).

 
 
  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