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Hypogymnia spp. |
Ramalina farinacea |
This Cladonia portentosa growing on moss is the largest single specimen I've seen so far. It is around 25 cm across:
This photo of a small Spruce shows how densely lichens can grow in the right environment. I've counted at least 30 specimens in the photograph.
Here's a real close-up of some Sphagnum Moss. The red colouration covers large areas.