Comparison of Ptisana papuana (left column) and Ptisana smithii (right column) A, B whole plants Ptisana smithiiB showing its distinctively repand margins C, D fertile segments with mature synangia. Ptisana papuana (left) has longer synangia that reach nearly the midpoint between the margin and the midrib, and conspicuously serrate margins E, F Pulvini, closeup.

  Part of: Murdock AG, Chen C-W, Huang Y-M, Glenny D (2020) Affinities of the fern genus Ptisana (Marattiaceae) in the Solomon Islands, with descriptions of two new species. PhytoKeys 170: 1-23.