(2892) Proposal to conserve the name Dennstaedtia (Dennstaedtiaceae) with a conserved type

LUZ AMPARO TRIANA-MORENO; PEDRO BOND SCHWARTSBURD; YAÑEZ, AGUSTINA; NELSON TÚLIO L. PENA; LI-YAUNG KUO; CARL ROTHFELS; MICHAEL SUNDUE

TAXON

INT ASSOC PLANT TAXONOMY

Lugar: Viena; Año: 2022 vol. 71 p. 688 - 690

0040-0262

With the advent of molecular phylogenetics, Perrie & al. (in Austral. Syst. Bot. 28: 256?264. 2015), Schneider & al. (in Perspect. Pl. Ecol. Evol. Syst. 18: 70?78. 2016), Shang & al. (in Molec. Phylogen. Evol. 127: 449?458. 2018), Schwartsburd & al. (in Molec. Phylogen. Evol. 150: 106881. 2020), and Wang & al. (in Taxonomy 1: 256?265. 2021) demonstrated the paraphyly (or polyphyly) of Dennstaedtia, with Microlepia and small segregates (Leptolepia Prantl, Oenotrichia Copel.) nested within it. Some taxonomic solutions have been suggested (e.g., Schneider & al., l.c.; Schwartsburd & al., l.c.), but these were made without a clear understanding of the phylogenetic position of Dennstaedtia flaccida, which has only recently been included in a phylogenetic analysis (Triana-Moreno & al. [the same authors of this proposal], submitted to Taxon). We now confirm the inference by Tryon & Tryon (l.c. 1980) of D. flaccida, the current type of Dennstaedtia, as nested within Microlepia spp. (37 species in our sampling, but probably representing ca. 60 spp.). Three other major clades are formed: one with five north-temperate species currently classified in Dennstaedtia (with alternative names in Sitobolium and Coptidipteris Nakai & Momose); another clade with only two Neotropical species, currently classified in Dennstaedtia (with no other generic name available); and another, a more distant clade, representing the main core of ?Dennstaedtia?, with 26 pantropical species in our sampling (but probably representing ca. 50?60 spp.), currently classified in Dennstaedtia (along with Leptolepia and Oenotrichia, with one species each), with alternative names in Patania.In order to reach a natural, monophyletic classification, nomenclatural changes will be necessary.