Multiple Lichen occupying the sweet spots
Lichen, at least some species can be very old, one can even date by the size of some ssp of lichen....
BaaderBaader Planetarium UFilterBaader UUG11xxUVUltraviolet Venus FilterUltraviolet imageUltraviolet photographyVenus Filterhighly specialized filternarrow band filterultraviolet
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