Traditional dyes of the Scottish Highlands are the native vegetable dyes used in Scottish Gaeldom.
Prunus spinosa
Vaccinum myrtillus
Betula
Ligustrum vulgare
Lichen
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A lichen is a hybrid colony of algae or cyanobacteria living symbiotically among filaments of multiple fungus species, along with bacteria embedded in the cortex, or "skin", in a mutualistic relations
A tree covered with leafy foliose lichens and shrubby fruticose lichens
Letharia vulpina, wolf lichen, grows like a multiple-branched tuft or leafless mini-shrub, so it has a fruticose growth form.
Flavoparmelia caperata has leaf-like structures, so it is foliose.
Caloplaca marina grows like an orange crust coating the rock, so it is crustose.