Since the nine-year survey of the Middlesex Fells was completed in the Fall of 2011, and published in Rhodora in 2012 (Hamlin et al. 2012), we have continued to make regular visits to the reservation. As a result of four more seasons of fieldwork, from 2012 through 2015, we have made many additional discoveries that have further confirmed our original results.

We have found 56 more taxa in addition to the 868 reported in 2012. Forty-two of these have never been reported in the Fells before (Table 1), and the remaining 14 had been reported in earlier surveys (Table 2). This represents a 6.5% increase in taxa since our 2012 paper, and accounts for some of the predicted under-reporting that is part of all surveys. Of the 42 taxa not previously reported in the...

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