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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
 
Reproduction:
Fruits like jam-tarts
Isidia - darker nail-like outgrowths
 

Soredia (powdery masses) on edges
Soredia in spots or cracks on upper surface
 
None