On my drawing table today. Work-in-progress.
Xanthoria parietina, also known as: wall lichen, yellow wall lichen, common yellow wall moss, maritime starburst lichen, and yellow crotal.
It's the last one that's intersting, as it indicates this was used as a dye. Colours acheived include: yellow, tan, pink and even blue.
The many uses of Xanthoria parietina
Don't try this at home!
India: as a shampoo.
UK: as a decoration as a mosaic of plants on wooden trays during well dressing festivals in Derybshire.
Europe: boiled with milk to treat a fever and jaundice and diarrhea.
Europe: a substitute for quinine.
Spain: mixed with wine for menstrual complaints and various pains.
Spain: for kidney disorders.
Spain: tooth ache.
Spain: an ingredient in a cough syrup.
China: an antibacterial