I haven’t a clue what this fungus is, growing on the side of a tree trunk felled last year, which hasn’t started to rot yet. It reminds me of the corals that we saw while snorkelling on, or rather over, the Great Barrier Reef several years ago. There is a “coral fungus” that grows on dead trees, but I don’t think that this is it. Pretty though, in a sort of grungy way.