Ivan A. Valdespino

TL;DR: A modern, comprehensive classification for lycophytes and ferns, down to the genus level, utilizing a community‐based approach, that uses monophyly as the primary criterion for the recognition of taxa, but also aims to preserve existing taxa and circumscriptions that are both widely accepted and consistent with the understanding of pteridophyte phylogeny.

TL;DR: The taxonomic separation of S. ophioderma, S. praestans and S. quadrifaria, as currently conceived, allowed them to clearly separate them as discussed by the authors .

TL;DR: Selaginella rachipterygia is notable for its often flagelliform branch, stem, and strobilus tips, which are often gemmiferous, and by its lateral leaves perpendicular to the main stems below the first branches, which give the stems the appearance of having wings.