Evolutionary history of plants foliage consisted of fern-like fronds, although they were not closely related to ferns. The oldest fossil evidence of seed plants is of Late Devonian age, and they appear to have evolved out of an earlier group known as the progymnosperms. These early seed plants ranged from trees to small, rambling shrubs; like most early progymnosperms, they were woody plants with fern-like foliage. They all bore ovules, but no cones, fruit or similar. While it is difficult to track the early evolution of seeds, the lineage of the seed ferns may be traced from the simple trimerophytes through homosporous Aneurophytes. This
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