Gloeocapsa magma, a form of algae, will find its way on any roof or siding. It lowers the lifetime of your roof, can cause damage and, not to mention, is an eye sore. Gloeocapsa magma has gained notoriety in the Southeastern United States, but, it is also spreading throughout the Midwest. This particular type of cyanobacteria is responsible for creating black stains and streaks on roofs. The bacteria accumulate over time as it feeds on moisture and calcium carbonate. This accumulation begins to show the black stains as the cyanobacteria develop their dark and hard UV-protective outer coating. Once the bacteria have become noticeable, the stains will continue to worsen year to year. If left untreated, the growth may hold moisture within shingles causing premature aging, rotting, and/or granule loss. The growth also has the potential to allow moss and/or lichen. Moss and lichen can cause a considerable amount of damage in a short amount of time. If you have black streaks, or, notice the start of the streaks, get them removed immediately!