On my fairly frequent perambles if I come across a new area of Bryophytes I take a small sample ( around 2cm x 2 cm) for identification. It saves lying on the ground with a x10 or X20 loupe or constantly bending down. ( The bending down is easy it's the getting up again.) I do keep some of these small samples if I've been unable to identify the plants and add them all to a tray with the location. It's amazing how some plants adapt very quickly.
This is representative one such tray, it's from this week.
I use quarter trays so that does indicate just how small these Bryophytes are.