Mold Types Glossary

Not all mold is created equal. Use this guide to identify some common species—and know when to call a pro. MoldWarden serves Solana Beach, Carlsbad, Encinitas, and North San Diego County.

1. Black Mold (Stachybotrys chartarum)

Appearance: Slimy, dark greenish-black.

Risk: High. Produces mycotoxins linked to lung bleeding.

Found in: Water-damaged drywall, behind wallpaper.

Action: [Professional remediation required]

2. Aspergillus

Appearance: Powdery, green/white/yellow.

Risk: Moderate. Some strains produce carcinogenic aflatoxins.

Found in: AC units, damp fabrics.

3. Cladosporium

Appearance: Olive-green to brown, suede-like.

Risk: Low. Triggers allergies.

Found in: Carpets, upholstery.

4. Penicillium

Appearance: Blue-green, velvety.

Risk: Moderate. Causes sinus infections.

Found in: Water-damaged insulation, mattresses.

5. Alternaria

Appearance: Dark gray/black, fuzzy.

Risk: High allergen. Linked to asthma.

Found in: Showers, under sinks.

6. Chaetomium

Appearance: White early, turns gray-black.

Risk: Moderate. Musty odor.

Found in: Leaky roofs, basements.

7. Fusarium

Appearance: Pink/white cottony growth.

Risk: High. Can infect eyes/nails.

Found in: Carpeting, humidifiers.

8. Aureobasidium

Appearance: Pink/brown, turns black.

Risk: Low. Skin irritant.

Found in: Window caulk, painted surfaces.

9. Trichoderma

Appearance: White/green woolly patches.

Risk: Moderate. Destroys wood.

Found in: Damp wood, wallpaper glue.

10. Serpula lacrymans

Appearance: Rust-colored, slimy.

Risk: High. "House-eating mold."

Found in: Structural timber.

11. Ulocladium

Appearance: Black, similar to Stachybotrys.

Risk: Moderate. Indicates water damage.

Found in: Kitchens, bathrooms.

12. Mucor

Appearance: White/gray, fluffy.

Risk: High. Can infect lungs.

Found in: HVAC systems, ductwork.

Found one of these molds? Schedule a professional inspection to stay safe.

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