Similar in many ways to U. botrytis, U. chartarum forms dark, robust colonies that proliferate rapidly on damp or waterlogged gypsum board, wallpaper, and wood. Its spores can aggravate respiratory issues, and its presence often reveals deeper moisture problems in a building. Fully rectifying the underlying cause—such as a pipe leak or roof defect—is crucial, alongside discarding or professionally cleaning heavily infested materials.
