Wikipedia
Myxotrichaceae
The Myxotrichaceae are a family of fungi in the class Ascomycetes. The family has seven genera. Fungi in this family are found in soil. In indoor, They occur in paper substrates, damp drywall, and decomposing materials. They produce black, mesh-like, setose ascocarps with small, fusiform ascospores. Myxotrichum deflexum produces a pinkish red diffusing pigment and may produce stains on paper surfaces. No reports of mycotoxins, pathogenicity, or allergy are known.