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Low RiskAllergenic MoldVery common

Cladosporium

Cladosporium spp.

Also known as: C. cladosporioides, C. herbarum, C. sphaerospermum

Olive-green to brown velvety colonies; often develops powdery surface as spores mature; may show concentric rings

Medically & technically reviewed byChristian MaggioFounder & President, InspectaMold

Gulf Coast Relevance: Critical

One of the most common and consequential molds in Gulf Coast structures.

Appearance & Identification

Colors
Olive greenBrownDark greenBlackGray-green
Texture

Suede-like to powdery; velvety surface

Pattern

Branching colonies with characteristic tree-like microscopic structure

Moderate moisture requirement; one of the first molds to colonize damp materials

Growth Conditions

Humidity

60-85%

Water Activity

0.85-0.90 aw

Temperature

32-95°F (0-35°C)

Common moisture sources
Window condensationBathroom humidityHVAC moistureGeneral elevated humidity

Common Growth Locations

Window sills and framesBathroom surfacesHVAC system componentsTextiles and fabricsCarpet and upholsteryPainted surfacesRubber and gasketsUnder sinks and near plumbing

Health Considerations

Primary concerns
Allergic reactionsHay fever symptomsAsthma triggeringEye and skin irritation
Respiratory effects

Allergic rhinitis, Asthma exacerbation, Sinus irritation, Sneezing and congestion

Allergenic potential

high

Immunocompromised risk

Low - rarely causes infections; occasional reports of skin and nail infections

How Our Inspectors Detect It

Moisture readings

Often found where moisture content is 14-20%

Likely materials
  • Window frames (wood and vinyl)
  • Bathroom surfaces
  • Textiles and carpet
  • HVAC components
  • Paint films
Thermal imaging clues
  • Condensation at windows
  • Cool spots indicating moisture
  • HVAC moisture signatures
Hidden growth indicators
Olive discoloration at windowsMusty odor near windows/bathroomsElevated spore counts in air samples

Remediation Considerations

Containment level:standard
Porous materials

Light growth can be HEPA vacuumed; heavy growth may require removal

Non-porous materials

Standard cleaning with detergent and antimicrobial

Moisture correction priority

Address condensation and humidity; typically straightforward correction

Frequently Asked Questions

Is Cladosporium (Cladosporium spp.) dangerous?

Cladosporium is classified as a low-risk, allergenic mold with high allergenic potential. Primary health concerns include allergic reactions, hay fever symptoms, asthma triggering, eye and skin irritation. Low - rarely causes infections; occasional reports of skin and nail infections A professional assessment determines the extent and the right response for your property.

Where does Cladosporium grow in Gulf Coast homes?

Cladosporium commonly appears in window sills and frames, bathroom surfaces, hvac system components, textiles and fabrics. It thrives at 60-85% relative humidity with a water activity of 0.85-0.90 aw, conditions that are common across humid Louisiana and Mississippi Gulf Coast properties.

How do you identify Cladosporium?

Olive-green to brown velvety colonies; often develops powdery surface as spores mature; may show concentric rings Colonies are typically olive green, brown, dark green with a suede-like to powdery; velvety surface texture. Mild musty odor; often not detectable at low concentrations Confirmation requires professional sampling and laboratory analysis rather than visual identification alone.

What does remediation of Cladosporium involve?

Cladosporium typically calls for standard containment. Light growth can be HEPA vacuumed; heavy growth may require removal Address condensation and humidity; typically straightforward correction InspectaMold documents the conditions and provides an independent protocol so the underlying moisture source is corrected, not just the visible growth.

Concerned about Cladosporium 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.

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