Maybe it's time someone produce a survey of the flora of rotting fence posts. There are so many fascinating and often beautiful examples of these miniature gardens, colonised by mosses, lichens, fungi and flowering plants, where the water retentive end-grain of the wood provides just enough moisture for the organisms to survive throughout the year.
Pixie-cup lichens Cladonia spp. are some of the commonest colonisers. I noticed this exquisite example on the site of the former Brancepeth colliery at Willington in County Durham.
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