Ulocladium spp.

A dark colored fungi that grows in places similar to Stachybotrys spp., Ulocladium spp. is often found growing in water damaged sheetrock. 

It is hard to distinguish between Alternaria spp. and Ulocladium spp. in an Air-O-Cell cassette sample if the spores are not in chains.  The colony growth on a culture plate is also similar.  The growth in culture is different. The Ulocladium spp. spores are borne singly on short conidiophores. The Alternaria spp. spores are in chains.

The organism grows well at 25 C for PDA and MEA and a bit slower on DG-18.

Ulocladium spp. line drawing - N. Carlson

Ulocladium spp. 400x growing in culture - N. Carlson

Ulocladium spp. growth in culture - N. Carlson