This lichen was on an old mature Rowan Tree by the River Inver
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Looks like you've got the lichening bug!
Your microscope photo also shows Normandina pulchella with tiny green-blue lobes and green-yellow soredia.
Second photo has what looks to be possibly Sticta limbata or Peltigera collina on the right.
Sticta's have a tomentose (slightly furry) under surface with pale cyphellae, Peltigera collina has a ridged under surface with rhizines (root-like attachment organs).
Lat/Lng: 58.1, -5.2
OS grid ref: NC1524