Historically recognized plant genera

thumb|Calamus glaucescens, formerly Ceratolobus glaucescens

Jamesoniella is a formerly accepted genus of liverworts. It is considered to be included in the genus Syzygiella, but one species, Jamesoniella convoluta, has not be transferred to that genus nor synonymized.

thumb | right | Ctenopteris heterophylla Ctenopteris is a defunct genus of ferns in the family Polypodiaceae. The name is derived from two Greek words: ktenos, "comb", and pteris, "fern".

Cryptothallus is a previously recognized genus of liverworts in the family Aneuraceae. The plants are small, and are white to pale green as a result of lacking chlorophyll. This feature led to the creation of a separate genus. The morphology of species assigned to Cryptothallus is very similar to that of Aneura. As a result, Karen Renzaglia in 1982 suggested that the only species then placed in the genus, Cryptothallus mirabilis, may be considered "merely as an achlorophyllous species of Aneura." Wickett and Goffinet argued the same position on the basis of sequences of nuclear, mitochondrial,