Evolutionary history of plants and radially symmetrical, is an integumented megasporangium surrounded by a cupule. The megasporangium bears an unopened distal extension protruding above the multilobed integument. It is suspected that the extension was involved in anemophilous pollination. "Runcaria" sheds new light on the sequence of character acquisition leading to the seed. "Runcaria" has all of the qualities of seed plants except for a solid seed coat and a system to guide the pollen to the ovule. The first spermatophytes (literally: "seed plants") – that is, the first plants to bear true seeds – are called pteridosperms: literally, "seed ferns", so called because their
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