Stachybotrys (Black Mold)
Stachybotrys chartarum
Also known as: Toxic black mold, Black mold, S. atra
Distinctive slimy black colonies when actively growing with moisture; becomes powdery and sooty when dried. Dense irregular growth pattern following cellulose substrate
Gulf Coast Relevance: Critical
One of the most common and consequential molds in Gulf Coast structures.
Appearance & Identification
Slimy when actively growing; powdery when dry
Dense, irregular patches following water damage patterns
Requires sustained high moisture over extended period; indicates chronic water intrusion
Growth Conditions
90%+ sustained for extended period
0.94+ aw (among highest requirements)
68-86°F (20-30°C)
Common Growth Locations
Health Considerations
Chronic cough, Difficulty breathing, Wheezing, Sinus congestion, Nosebleeds, Pulmonary hemorrhage (rare, infants)
severe
Extremely elevated concern; presence indicates environment unsuitable for immunocompromised occupancy until remediated and verified
Produces satratoxins (macrocyclic trichothecenes) - among most toxic fungal metabolites known. Also produces atranones and phenylspirodrimanes. Health effects from chronic exposure include respiratory, neurological, and immunological symptoms. Definitive causal relationships debated in scientific literature, but precautionary approach warranted
How Our Inspectors Detect It
Requires sustained moisture; typically found in materials >30% moisture content maintained over weeks to months
- •Paper-faced gypsum board (primary)
- •Ceiling tiles
- •Cellulose insulation
- •Cardboard and paper
- •Jute backing
- •Some wood products
- •Active or recent water intrusion
- •Wet wall cavities
- •Chronic moisture signatures
- •Hidden leak pathways
Remediation Considerations
ALL affected porous materials MUST be removed and disposed of as contaminated waste. No cleaning or salvage of affected porous materials
Thorough HEPA vacuuming, wet wiping with antimicrobial, and verification. Structural elements require professional assessment
CRITICAL AND PREREQUISITE - Water intrusion source MUST be identified and corrected before remediation begins. Structural drying to appropriate levels required
Frequently Asked Questions
Is Stachybotrys (Black Mold) (Stachybotrys chartarum) dangerous?
Stachybotrys (Black Mold) is classified as a severe-risk, toxic mold with severe allergenic potential. Primary health concerns include respiratory symptoms, neurological symptoms reported, chronic fatigue, persistent headaches, skin irritation, immune system effects. Extremely elevated concern; presence indicates environment unsuitable for immunocompromised occupancy until remediated and verified A professional assessment determines the extent and the right response for your property.
Where does Stachybotrys (Black Mold) grow in Gulf Coast homes?
Stachybotrys (Black Mold) commonly appears in water-damaged gypsum wallboard (paper facing), ceiling tiles with chronic leaks, behind wallpaper with moisture, cardboard and paper materials. It thrives at 90%+ sustained for extended period relative humidity with a water activity of 0.94+ aw (among highest requirements), conditions that are common across humid Louisiana and Mississippi Gulf Coast properties.
How do you identify Stachybotrys (Black Mold)?
Distinctive slimy black colonies when actively growing with moisture; becomes powdery and sooty when dried. Dense irregular growth pattern following cellulose substrate Colonies are typically black, dark greenish-black, very dark green with a slimy when actively growing; powdery when dry texture. Strong, pungent musty odor often described as rotting, wet newspaper or earthy decay Confirmation requires professional sampling and laboratory analysis rather than visual identification alone.
What does remediation of Stachybotrys (Black Mold) involve?
Stachybotrys (Black Mold) typically calls for full containment. ALL affected porous materials MUST be removed and disposed of as contaminated waste. No cleaning or salvage of affected porous materials CRITICAL AND PREREQUISITE - Water intrusion source MUST be identified and corrected before remediation begins. Structural drying to appropriate levels required InspectaMold documents the conditions and provides an independent protocol so the underlying moisture source is corrected, not just the visible growth.
Concerned about Stachybotrys (Black Mold) in your property?
InspectaMold provides independent, lab-backed mold inspection and air quality testing across the Louisiana and Mississippi Gulf Coast. Get an accurate identification and a clear plan.