Exophiala
Exophiala spp.
Also known as: Black yeast
Black yeast-like colonies that mature to a velvety dematiaceous mat in chronically wet areas
Exophiala at a Glance
Exophiala (Exophiala spp.) is a elevated-risk, pathogenic mold with moderate allergenic potential. It most often grows in drains, faucet aerators, humidifiers, and its primary health concerns are opportunistic infections, allergic responses, biofilm colonization. Confirmation requires laboratory analysis of collected samples — visual identification alone is not conclusive.
- Risk level
- Elevated
- Category
- Pathogenic
- Common growth locations
- Drains, Faucet aerators, Humidifiers, Steam rooms
- Primary health concerns
- Opportunistic infections, Allergic responses, Biofilm colonization
InspectaMold provides independent inspection and laboratory testing for Exophiala across Southeast Louisiana — assessment and documentation only. We do not perform remediation, so findings stay unbiased.
Gulf Coast Relevance: High
Frequently found in Louisiana and Mississippi Gulf Coast homes.
Appearance & Identification
Slimy yeast-like, becoming velvety
Dark slimy colonies in wet plumbing niches
Highly hydrophilic; colonizes biofilms in drains, humidifiers, and steam areas
Growth Conditions
95-100%
0.95+ aw
75-104°F (24-40°C)
Common Growth Locations
Health Considerations
Respiratory infection risk in vulnerable patients, Allergic responses
moderate
Significant — can cause systemic phaeohyphomycosis; a particular concern for cystic fibrosis and immunocompromised patients
How Our Inspectors Detect It
Saturated/wet fixtures and biofilm surfaces
- •Plumbing fixtures
- •Drain biofilm
- •Humidifier components
- •Tile grout
- •Warm wet plumbing zones
Remediation Considerations
Remove colonized porous materials; disinfect plumbing biofilms
Disinfect fixtures, descale, and remove biofilm; service humidifiers
Critical — eliminate standing water and biofilm reservoirs
Frequently Asked Questions
Is Exophiala (Exophiala spp.) dangerous?
Exophiala is classified as a elevated-risk, pathogenic mold with moderate allergenic potential. Primary health concerns include opportunistic infections, allergic responses, biofilm colonization. Significant — can cause systemic phaeohyphomycosis; a particular concern for cystic fibrosis and immunocompromised patients A professional assessment determines the extent and the right response for your property.
Where does Exophiala grow in Gulf Coast homes?
Exophiala commonly appears in drains, faucet aerators, humidifiers, steam rooms. It thrives at 95-100% relative humidity with a water activity of 0.95+ aw, conditions that are common across humid Southeast Louisiana properties.
How do you identify Exophiala?
Black yeast-like colonies that mature to a velvety dematiaceous mat in chronically wet areas Colonies are typically black, olive-black, dark brown with a slimy yeast-like, becoming velvety texture. Damp, biofilm-associated odor Confirmation requires professional sampling and laboratory analysis rather than visual identification alone.
What does remediation of Exophiala involve?
Exophiala typically calls for enhanced containment. Remove colonized porous materials; disinfect plumbing biofilms Critical — eliminate standing water and biofilm reservoirs InspectaMold documents the conditions and provides an independent protocol so the underlying moisture source is corrected, not just the visible growth.
Concerned about Exophiala in your property?
InspectaMold provides independent, lab-backed mold inspection and air quality testing across Southeast Louisiana. Get an accurate identification and a clear plan.