Serpocaulon ×rojasianum (Polypodiaceae): A new fern hybrid from Costa Rica

Taxonomic Revision of Serpocaulon (Polypodiaceae)

“…By creating a smaller, more manageable genus, Smith et al (2006) stimulated research on the group (Chaves-Fallas et al, 2015). Since the 40 names established by Smith et al (2006), new taxa and new combinations have been published for species in Argentina (Sanín et al, 2019a), Brazil (Labiak & Prado, 2008;Schwartsburd & Smith, 2013;Sanín & Salino, 2020), Colombia (Sanín & Torrez, 2014;Sanín, 2015Sanín, , 2018, and Costa Rica (Rojas-Alvarado & Chaves-Fallas, 2013;Chaves-Fallas et al, 2015).…”

“…Collapsed spores are often found in hybrids (Chaves-Fallas et al, 2015), and Serpocaulon ×tabuleirense is no exception. In this case, the parents have contrasting morphologies: S. triseriale has spores without perine, while S. vacillans has spores with thin folded perine, producing linear ridges.…”

“…Some types are incomplete, lacking rhizomes and locality information. Finally, morphological variation, plasticity, distribution, ecological amplitudes, and putative hybridization (Rojas-Alvarado & Chaves-Fallas, 2013; Sanín & Torrez, 2014; Chaves-Fallas et al, 2015) need further observation and study in order to address gaps in our knowledge.…”

“…Many authors have mentioned the need for an exhaustive taxonomic revision of species now included in Serpocaulon (Moran, 1990(Moran, , 1995Smith et al, 2006;Kreier et al, 2008;Labiak & Prado, 2008;Schwartsburd & Smith, 2013;Sanín, 2018). attempted a revision of the Polypodium loriceum L. group (which basically corresponds to Serpocaulon) based on morphological characters, and several new taxa have been described or combined since then (Labiak & Prado, 2008;Rojas-Alvarado & Chaves-Fallas, 2013;Schwartsburd & Smith, 2013;Sanín & Torrez, 2014;Chaves-Fallas et al, 2015;Sanín, 2015Sanín, , 2018Sanín et al, 2019a;Sanín & Salino, 2020). However, the proliferation of names is one of the pitfalls faced by taxonomists when synthetic or revisionary works are unavailable for a particular group (Moran, 1987).…”

New record of Serpocaulon triseriale (Sw.) A.R. Sm. (Polypodiaceae) in Argentina, with morphological comparison of relatives

“…Several new taxa of Serpocaulon have been described or recognized recently (Labiak and Prado 2008, Rojas and Chaves-Fallas 2013, Schwartsburd and Smith 2013, Sanín 2014, 2015, Sanín and Torrez 2014, Chaves-Fallas et al 2015. However, data on the distribution, ecology and conservation of this genus is mostly incomplete (Sanín 2018).…”