The tetrad map above shows the position (for vice-counties 69 and 70 only) at the date given, and is updated at intervals. Note that only tetrads with 50 species or more recorded have a symbol. Most of the ‘blank’ tetrads have some records post-2000, but often limited to a few species ‘of interest’, and still await ‘listing’ visits.
The recording-meetings in 2019 have been targeted at some of the obvious underworked areas.
This is the very last season of recording for BSBI’s project Atlas 2020. There is currently a great deal of recording taking place across the county, so if you are intending recording in an apparently unrecorded or under-recorded area, you should contact Phill Brown to ascertain the very latest position. (There are contact forms on this site, e.g. at the bottom of this page.)
Please let us know promptly (and get the results to Phill ASAP) if you have recorded in any of these ‘blank’ areas, so that we can avoid duplication of effort. For obvious reasons, this applies particularly if you intend to visit or have visited any of the high altitude tetrads, each likely to involve a long and arduous day over often very rough ground to maximise the haul of records.
The maps below show the position as it was before each of the recording seasons 2019, 2018, 2017:
The diversity of vascular plant species in the county increases somewhat from north to south, but is also obviously very dependent on altitude, soil-type, land-use, presence of river-courses, etc. A typical lowland tetrad in this part of the planet with a reasonable range of habitats should reveal at least 250–300 species after a thorough survey, with visits through the season. In southern Cumbria, this may rise to over 400.
Although the highest ground has a very limited range, at the scale of the tetrad most squares will have some lower ground with much greater diversity. This is more true of the Lake District mountains with their deeply dissected topography; some plateau areas of the high northern Pennines lie at middle to high altitudes throughout.
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