History of botany scope of the subject as technology has opened up new techniques and areas of study. Modern molecular systematics, for example, entails the principles and techniques of taxonomy, molecular biology, computer science and more. Within botany there are a number of sub-disciplines that focus on particular plant groups, each with their own range of related studies (anatomy, morphology etc.). Included here are: phycology (algae), pteridology (ferns), bryology (mosses and liverworts) and palaeobotany (fossil plants) and their histories are treated elsewhere (see side bar). To this list can be added mycology, the study of fungi, which were once treated as plants, but
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