Ochrolechia tartarea lichen (crottle /crotal)

Ideas for a new house dress / wrap apron.
Ochrolechia tartarea lichen (crottle /crotal) 
Called 'crottle' or 'crotal' in the Highlands and Islands of Scotland. Pen and ink drawing, with photoshop for colour and design layout.

Used as a dye in the UK (red/purple), aparently collected in May - June then soaked in urine for weeks before being dried  in 'cakes' in peat smoke to dry.  




Ochorlechia tartarea in Manchester Museum herbarium collection.