This interim Census Catalogue includes additions and amendments compiled in 2008, 2009 and 2010, as well as records (debracketers; Hill 2010) that had been submitted to the Biological Records Centre but had not been entered to the database in time to prevent their vice-county being signified as an old (pre-1960) record in the Census Catalogue (Hill et al. 2008). Symbols and conventions are as in the Census Catalogue, except for the addition of the dagger † (also known as an obelisk or obelus) used to denote persisting introductions, i.e. records of introduced species that have been present for at least 10 years but which have not spread to the surrounding environment from the substrate or plant on which they were introduced (Blockeel 2010)
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