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
Pitcher Plants of the Old World M. Christenhusz and Michael F. Fay wrote: This is to date the only publication dealing with the genus "Nepenthes" throughout its geographical range. He [McPherson] humbly refers the reader to other taxonomic works, but these are all regional treatments. The level of information provided on all the species of "Nepenthes" is outstanding and has no precedent. Pitcher Plants of the Old World Pitcher Plants of the Old World is a two-volume monograph by Stewart McPherson on the pitcher plants of the genera "Nepenthes" and "Cephalotus". It was published in May 2009 by Redfern Natural History Productions and covers all species