A guide to lichens on twigs

Foliose lichens

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Colour: Grey Green Brown Yellow
Lower Surface:  
Dark brown to black

White to pale brown
Upper Surface:  
With paler lines or spots

With uniform colour
Fruits like jam-tarts

Isidia - darker nail-like outgrowths

Soredia (powdery masses) on edges

Soredia in spots or cracks on upper surface