A guide to lichens on twigs

Crustose lichens

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White, to pale grey, to yellow
Green, to grey-green, to brown
Same colour as bark, but fruits present
No distinct crust, fruits scattered on bark surface
Continuous crust with distinct colour and margins
Granular or powdery crust without distinct margins
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