Customer asked if this was "Black Mold" It is black but they were referring to Stachybotrys. We took a swab and took it to an accredited lab.
Turns out it was Cladpsporium. One of the most common genera worldwide. Found in soil and plant debris and on the leaf surfaces of living plants. The outdoor numbers are lower in the winter and often relatively high in the summer, especially in high humidity. The outdoor numbers often spike in the late afternoon and evening. Indoors, it can be found growing on textiles, wood, sheetrock, moist window sills and in HVAC supply ducts.