Gymnosphaera
Gymnosphaera is a genus of tree ferns in family Cyatheaceae.
Taxonomy
The genus was originally described by Carl Ludwig Blume in 1828. It was frequently treated by later authors as a synonym of Cyathea or Alsophila.In the Pteridophyte Phylogeny Group classification of 2016, Gymnosphaera was left as a synonym of Alsophila, as evidence to support its reliable separation was lacking. More recently, Shi-Yong Dong and collaborators proposed the revival and recircumscription of the genus based on additional phylogenetic evidence, an act subsequently accepted by other tree fern workers.