Selaginella xanthoneura Valdespino. A Lateral leaf from stem, upper surface. B proximal half of lateral leaf, upper surface (same leaf shown in A) C distal half of lateral leaf, upper surface (same leaf shown in A) D lateral leaf, lower surface E proximal half of lateral leaf, lower surface (same leaf shown in D) F distal half of lateral leaf, lower surface (same leaf shown in D); note, submarginal, elongate and papillate idioblasts (F1) G median leaf from stem branch, upper surface H proximal half of lateral leaf, upper surface (same leaf shown in G); note submarginal band of idioblasts (a) and stomata along midrib (b) I distal half of median leaf, upper surface (same leaf shown in G); note, short elongate and papillate idioblasts (a). A–I taken from the holotype.