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Many thanks firefly. I know Fomes fomentarius and I sometimes go to Finland, so must look hard for those filaments there and in other countries where keroplates is found and then come back at night. The films the bioluminescent footage I mentioned was in are very old BBC productions; The Trials of Life series (1990) Vampires, Devilbirds and Spirits (1994) and Beetlemania (1996), but I remember the experiences very well!