Selaginella papillosa Valdespino. A Section of upper surface of stem showing median and lateral leaves B median leaf, upper surface C distal half of median leaf, upper surface (same leaf shown in B) D proximal half of median leaf, upper surface (same leaf shown in B) E section median leaf inner half, upper surface; note prominent papillae on cells (E1) F detail of midsection of median leaf, upper surface G lateral leaf and sections of median leaves, upper surface H portion of basiscopic margin of lateral leaf, upper surface; note submarginal stomata (a) I distal half of lateral leaf, upper surface, note short hair on leaf surface (a). A–I taken from the holotype.