Ferns / Danaea, Salpichlaena, Metaxya: Hanna Tuomisto (July 2021)
Polypodiaceae subfam. Grammitidoideae: Barbara Parris (September 2020)
Papaveraceae subfam. Fumarioideae: Magnus Lidén (Summer 2018)
Ferns of India and Nepal: Christopher Fraser-Jenkins (Winter 2019)
Many others contributed advice on the genus and species level. They are all acknowledged in the header of the genera.