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Crustose lichens

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Colour:
White, to pale grey, to yellow
Green, to grey-green, to brown
Same colour as bark, but fruits present
 
Surface:
No distinct crust, fruits scattered on bark surface
Continuous crust with distinct colour and margins
Granular or powdery crust without distinct margins
 
Reproduction:
Fruits like jam-tarts with margins same colour as the crust
Fruits like wine-gums with margins the same colour as center
Fruits elongated, wavy to star shaped
Fruits enclosed in pot- or volcano-like bodies with hole(s) for spore release
Fruits absent, soredia present