Lichen: Peltigera canina - the dog lichen | Nature Notes

My book says the dog lichen (Peltigera canina) is is a very common lichen found on walls, on rocks, on soil and amongst grass, even on lawns and sand dunes. That may be the case but in several years of looking I have only encountered it twice (so far!). It is a large foliose lichen; that is to say the main body of the lichen, the thallus, is a bit like leaves. 
You may be wondering why this is called dog lichen?



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