Selaginella altheae Valdespino. A Section of upper surface of stem branch showing median and lateral leaves B Close-up of median leaves from stem branch, upper surfaces C Close-up of median leaf from stem branch, lower surface D Close-up of median leaf from stem branch, upper surface E Close-up of distal portion and apex of median leaf, upper surface (same leaf shown in D); note, punctate to shortly elongate and papillate idioblasts (a) and stomata (b) along midrib F Close-up of proximal portion and base of median leaf, lower surface (same leaf shown in D); note, punctate to shortly elongate and papillate idioblasts (a), stomata (b) along midrib and submarginal and marginal portion near outer base and long cilia (c) on outer base. A–F taken from holotype, Maguire et al. 60249 (NY).