Lovely lichen

Lovely lichen

Observation - Lovely lichen - UK and Ireland. Description: These were stunning little things but i havent a clue what type but just nice to see. If anyone could tell me, fantastic! We've just got interested in lichens so please bear with us. Sorry to be cheeky but could anyone recommend a good reference book for

These were stunning little things but i havent a clue what type but just nice to see. If anyone could tell me, fantastic! We've just got interested in lichens so please bear with us. Sorry to be cheeky but could anyone recommend a good reference book for us please. Many thanks.