If you are interested in mosses, liverworts, and such plants, you for sure need to look at this website:
http://www.bbsfieldguide.org.uk/
Better still, go ahead and buy the book, for £25 including shipping.
http://rbg-web2.rbge.org.uk/bbs/Activities/Field_Guide_order.htm
The blurb says:
Our islands’ mosses and liverworts have long been neglected, so there is scope for anyone to make a valuable contribution to our understanding of their occurrence, distribution and ecology. Yet the want of a field-guide to mosses and liverworts has for many years hindered the spread of interest in British field-bryology. A team of expert bryologists, under the aegis of the British Bryological Society, has now produced the only modern field guide to mosses and liverworts of Britain and Ireland, enabling you to identify many of these with a hand lens in the field.
