Study of additional collections of Selaginella chiquitana M.Kessler, A.R.Sm. & M.Lehnert shows it to be conspecific with S. arroyoana M.Kessler & A.R.Sm. The apparent relationships of Selaginella arroyoana, its ecology and conservation status are discussed more fully. Scanning electron micrographs of spores and a map of its distribution are provided.