Sphagnum cuspidatum - Branches in pairs, appressed stem leaf
Racomitrium fasciculare - Sinuose leaf cells, numerous short branches
Sphagnum fimbriatum - Distinctive appressed stem leaves
Ptychomitrium polyphyllum - Check the leaf tip for teeth
Zygodon rupestris - Look for gemmae at leaf bases. Under the microscope these can tell you which species it is.
Fissidens exilis - A couple of these found growing on a decaying leaf stem which is a good pointer for ID.
Ceratodon purpureus - Look for red stem and leaf curved under the whole length.