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
The Private Life of Plants idea and, you know, nodded and was very complimentary about it and said that 'Actually, I was thinking about something a little bit bolder.' And sure enough, by the end of lunch, we'd all signed up to do six hours on plants." In the same programme, Attenborough also confessed that he conceived the series partly to realise a long-cherished ambition: to visit Mount Roraima, which is featured in the last episode. Attenborough knew that the subject matter had not been covered in depth on television before, and in his autobiography, "Life on Air", told of how he hit on the