| Gloeocapsa magma is an algae which has gained notoriety in the Southeastern U.S.
which is quickly spreading throughout the Midwest. The reason is these particular algae
are responsible for creating the unattractive black roof stains and/or streaks commonly
noticed by many. The algae, unicellular, accumulate over time; this accumulation begins
to show the problematic black stains as the algae develop their dark and hard UVprotective
outer coating.
The primary reasoning behind the rapid spread and noticeabilty of this algae is:
1. Rising humidity and temperatures combined with more and more algae spores
promotes their spread with these favorable conditions.
2. Fiberglass shingles (the most commonly seen amongst today's residential homes)
have been being made with limestone as a filler (in the asphalt). These shingles hold
moisture and organic "algae food" material longer (especially on the North-side in the
Midwest) than the paper/asphalt/ceramic shingles of 20+ years ago. Additionally, these
particular algae enjoy the limestone as a food source.
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