Vittarioideae worthy of subgeneric rank, while "Rheopteris" had not yet been discovered. "Haplopteris" he explicitly synonymized with "Vittaria" in 1914. Carl Christensen used the name "Vittarioideae" in Verdoorn's "Manual of Pteridology" in 1938, but did not include a description, leaving it nomenclaturally invalid. Ren-Chang Ching raised Vittariaceae to the rank of a family in 1940. The first well-sampled molecular phylogenetic study of the vittarioids was based on the chloroplast gene rbcL. In this study, it was found that the type species of "Monogramma" is embedded in "Haplopteris"; the segregation of "Vaginularia" from "Monogramma" was also supported, as members of "Vaginularia" formed
Vice-county Census Catalogue of the Vascular Plants of Great Britain Druce, which was published in 1932. The comprehensiveness of the work has been questioned by Hannah (2005), citing the Clyde Isles (vice-county 100), where he was able to trace 166 species for which there are records which he believed to be reliable, but which are not among the 891 listed for that vice-county. An errata list, correcting entries for 29 taxa, was published in "BSBI News" no. 97 p. 60 Vice-county Census Catalogue of the Vascular Plants of Great Britain The Vice-county Census Catalogue of the Vascular Plants of Great Britain () is an A5 softback book produced in 2003