Japanobotrychum
Japanobotrychum is a genus of ferns in the family Ophioglossaceae with the sole species Japanobotrychum lanuginosum. The genus is accepted in the Pteridophyte Phylogeny Group classification of 2016 , but not by some other sources.
Taxonomy
The genus Japanobotrychum was first described in 1931 by the Japanese botanist Genkei Masamune, with the only species being Japanobotrychum arisanense. This is now considered to be a synonym of Botrychium lanuginosum Wall. ex Hook. & Grev., first described in 1828, so the epithet lanuginosum has priority over arisanense.The Smith et al. classification of 2006, based on molecular phylogeny, lumped Japanobotrychum within Botrychium, in the Ophioglossaceae, which was continued in the Christenhusz et al. classification of 2011 and the Christenhusz and Chase classification of 2014. It is recognized as a distinct genus in Ophioglossaceae by the Pteridophyte Phylogeny Group classification of 2016.
The Pteridophyte Phylogeny Group classification of 2016 accepts the genus, with one species, as did the Checklist of Ferns and Lycophytes of the World as of 2019, whereas Plants of the World Online subsumed the genus into Botrychium.