Lichen and superstition - Crottle seeks its native rocks.
".... There was — and probably still is — a superstition among fishermen on the West Coast that seeks its native rocks and they were therefore averse to wearing garments dyed with or to taking on board anyone so clad..." http://www.dsl.ac.uk/entry/snd/crottle_n1
Crottle / crotal - A general terms for the dye-producing lichens in the Highlands and Islands of Scotland.
You can see 'North' my coastal lichen inspired coat in the exhibition 'Fabric of Place'.
Common names of Lichens on the coat:
Black - sea tar
Tan - sea star
white - crab eye
shaggy hood - sea ivory