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Five    Selaginella    species (i.e,    S.   gioiae   ,    S.   papillosa   ,    S.   pubimarginata   ,    S.   rostrata   , and    S.   xanthoneura   ) from Neotropical rainforests of South America are described and illustrated as new, while    S.   surucucusensis   , originally recorded only from Brazil, is redefined to account for species’ morphological characters throughout its expanded distribution range and also a novel illustration is provided for it. Inferred taxonomic affinities and conservation assessment are offered for species here treated.    Selaginella   gioiae    is native to Colombia, Ecuador, and Peru, and    S.   xanthoneura    is so far only known in Colombia, whereas    S.   surucucusensis    is now known to occur in Colombia and Venezuela in the north-central part of South America. These three species are included in the “   Selaginella   flabellata    group” based on their habit, stem shape, rhizophores position, and mega- and microspores color, and ornamentation.    Selaginella   papillosa   ,    S.   pubimarginata   , and    S.   rostrata    are native to Venezuela.    Selaginella   papillosa    and    S.   pubimarginata    morphologically belong in the “   Selaginella   deltoides    group” based on their habit, stem type, shape of lateral leaves and their indument type distributed on upper surface of the leaf lamina. On the other hand,    S.   rostrata    is considered to be a member of the “   Selaginella   microdonta    group,” which is centered in the Guiana Highlands, based on its habit, stem type, and leaf size and shape, and for which a key to identify species is provided. Finally, all species threated here are classified in subg.Stachygynandrum   based on their heteromorphic leaves, mostly quadrangular strobili, and monomorphic sporophylls shape (except for    S.   rostrata    that has slightly dorsiventral and flattened strobili with somewhat heteromorphic sporophylls).

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Taxonomic innovations in South American    Selaginella    (  Selaginellaceae  ,   Lycopodiophyta  ): description of five new species and an additional range extension