I found the slide graticules for our microscopes. I also viewed my ruler again below to show that the numbers are in millimetres and the smallest scale divisions are 0.1mm.
I found some moss on the summit of Skiddaw that I hoped was Racomitrium lanuginosum (Woolly Fringe-moss). https://rbg-web2.rbge.org.uk/bbs/activities/mosses/Racomitrium%20lanuginosum.pdf The key feature is the toothed hair point.