@acousticlover@freyaphotos - thank you! My son was telling me about the last of the moss and lichen specialists in the USA - I will have to read about him - a very elderly gent - but no-one has been interested enough to train with him. I think about that now when I look at my lichens. My son is doing the project too (VitaminK) and I am sure he will correct me if I had the wrong end of the stick - lol.