Appearance
Dark green to black, often with a wet or shiny look that becomes powdery when dry.
Where It Grows
On materials wet for at least 7+ days — usually drywall paper, OSB, or ceiling tiles.
Lookalikes
Many harmless molds also appear dark. Only lab analysis can confirm Stachybotrys.
What to Do
Don't disturb suspect growth. Contain the area and contact a professional inspector.
Need professional help?
American Mold provides independent mold inspection, testing, and indoor air quality services across San Marcos and North County San Diego.