Selaginella philipsonii (Jermy & Rankin) Valdespino. A Section of upper surface of stem showing median and lateral leaves B Close-up of median leaf, upper surfaces; note, inner margin and submarginal portion of outer margin composed of elongate, idioblast-like and papillate cells and stomata (a) along outer margin C Close-up of median leaf distal portion, upper surface; note, apex tipped by long, divergent cilia, cells with papillae and stomata along outer margin D Close-up of median leaf, upper surface; note, marginal stomata (a), submarginal portion of outer margin composed of elongate, idioblast-like and papillate cells and lumen of lamina cells with multiple papillae E Section of lower surface of stem showing lateral leaves, outer halves of median leaves and rhizophore F Close-up of (E) G Close-up of lateral leaf, lower surface (one of the leaf shown in E) H Close-up of lateral leaf, lower surface (same leaf shown in G); note, stomata along midrib, elongate, idioblast-like and papillate cells and long cilia along acroscopic margin. A–H taken from Steyermark & Rabe 96652 (GH).