Cladosporium

What is Cladosporium?

Cladosporium is one of the most common types of mold found both indoors and outdoors. It can grow in cool and warm climates alike. Indoors, it often appears as a dark green, brown, or black spot and is commonly found on fabrics, wood surfaces, and damp window sills.

Health Considerations

Cladosporium is generally considered allergenic rather than toxigenic. Exposure has been associated with allergic reactions, including asthma flare-ups, allergic rhinitis, skin rashes, and eye irritation in sensitive individuals. Long-term exposure may exacerbate chronic respiratory conditions. People with health concerns should consult a qualified healthcare professional. An independent mold assessment can help determine whether this mold is present in your property and document the moisture conditions that support its growth.

Why Visual Identification Is Not Enough

Cladosporium typically appears olive-green, brown, or black, but it closely resembles several other indoor molds. Color and surface appearance are not enough to distinguish it from other genera. Laboratory analysis of a sample is needed for reliable identification. The most reliable way to determine which species is present — and at what concentration — is through laboratory-verified mold testing. Air and surface samples analyzed by an independent laboratory provide the factual data needed to make informed decisions about next steps. For a broader overview, see our mold knowledge center.

Prevention & Management

Preventing Cladosporium involves keeping indoor areas dry and well-ventilated. Regularly clean areas prone to condensation, such as window sills and cooling coils. Using a dehumidifier and ensuring proper insulation can also help prevent the growth of this mold. Our clearance testing can provide you with a clear roadmap to address these concerns effectively.

Other Common Mold Types

Mold Testing Across Tampa Bay

We provide independent cladosporium testing and inspection for property owners throughout the region, including Tampa, Brandon, Wesley Chapel, Riverview, and St. Petersburg. We also provide independent commercial mold assessment for offices, retail, medical facilities, and multifamily properties, and post-remediation verification after a remediation contractor has completed their work.