Author(s)

Alexander Francisco Rojas-Alvarado^*, Lucía Barrantes-Calvo

Universidad Nacional de Costa Rica, Heredia, Costa Rica.

Four hybrids between Serpocaulon species have been described, one of them S. × sessilipinnum was the only known hybrid between two different clades proposed by Smith et al. In this work, a new hybrid S. × orosiense is described, being the second known hybrid between clades: 1) Serpocaulon loriceum and 2) S. fraxinifolium. The detailed study of the intermediate morphology of the characters of the new taxon and their progenitors were made by light microscopy with a Motic Instruments brand binocular stereoscope, Model SMZ-171-BLED and photographs of the spores with a Motic brand binocular microscope, model BA210E. The new nothotaxon has intermediate characters between S. fraxinifolium and S. loriceum as size of the frond; shape, division and apex of the leaf blade; shape, broad, apex and number of pinnae; and number of series of areoles and sori. As result and conclusion, a new nothotaxon with intermediate morphology between two progenitors is discovered between different clades within the genus Serpocaulon.

Ferns, Nothotaxon, Polypodiopsida, Serpocaulon fraxinifolium, S. loriceum

Rojas-Alvarado, A.F. and Barrantes-Calvo, L. (2021) Serpocaulon orosiense, a New Hybrid of Serpocaulon (Polypodiaceae) from Costa Rica. Open Access Library Journal, 8, 1-8. doi: 10.4236/oalib.1108047.