The most recent account of the bryophytes of Cornwall and the Isles of Scilly is David Holyoak’s flora, published on the Cornwall and Isles of Scilly Federation of Biological Recorders website. Please see the link below.
Holyoak, D. 2010? The Bryophytes of Cornwall and the Isles of Scilly
This bryophyte flora of Cornwall and the Isles of Scilly (SW. England) is published online at http://www.cisfbr.org.uk by the Cornwall and Isles of Scilly Federation of Biological Recorders (CISFBR). The flora is based on 48,532 tetrad records collected mainly by the author from 1993-2010. Comparisons are also made with 33,943 records made or assembled by Mrs Jean Paton from 1950-1992.
The text consists of:
Paton, J.A. 1969. A bryophyte flora of Cornwall. Transactions of the British Bryological Society, 5, 669-756.