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Distribution Maps of Lichens in Britain

The British Lichen Society's Distribution Maps Scheme was initiated in September 1964 with a view to producing maps of the distribution of lichen species within the British Isles on the basis of the 10 km square units of the national grid. As a result of data contributed to the Scheme by many members of the Society the distribution patterns of many lichen species within the British Isles are becoming clear. Some maps have already been published in connection with taxonomic and ecological studies and these are listed below. It is intended to publish selected distribution maps of species whose distribution patterns are now clear and which do not form parts of other studies in the Lichenologist; the first series of these maps is presented here. 1745 completed cards have been received by the Scheme of which 238 have over 100 records, 485 have 50-100 records and 1022 have less than 50 records. The distribution of these is summarized in Map 1. It will be clear from this figure that while there is a reasonable coverage of cards for most areas of England, Scotland and Wales, relatively few data are available for Ireland. Areas which are underworked must be borne in mind in interpreting the published distribution maps. It should also be emphasized that whilst a square in some Midland counties with about sixty species, for example, is probably well worked, one in areas such as Devon and Western Scotland with less than 150 species is probably incompletely known. In addition to verified records obtained through the Scheme, the published maps also incorporate information derived from herbarium studies, reliable literature reports and other records not yet passed to the Mapping Recorder. While many members of the Society have been involved in the collection of information utilized in the published distribution maps it must be emphasized that the checking of records, construction of the maps, and their legends are the responsibility of the compilers whose names appears beneath them. The Society is very grateful to the Biological Records Centre of the Nature Conservancy for financial support for the Mapping Scheme and for their help in the preparation of maps for publication.