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Black Spot Lichen on Roof Tiles: Causes & Treatment

Black Spot Lichen on Roof Tiles: Causes & Treatment

By Mark Cave October 30, 2026 |

What Causes Black Spot Lichen on Roof Tiles? Black spot lichen on roof tiles develops when lichen-forming fungi establish themselves alongside photosynthetic partners, usually algae or cyanobacteria. Wind, rain splash and birds can help spread biological material onto a roof. Given time, suitable moisture, light and a stable surface allow...

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