Growth responses of Alternaria sp., Cladosporium herbarum, Dendryphiella salina, Monodictys pelagica, Stachybotrys atra and Zalerion maritimum to temperature, pH, light and dark were studied. Temperature optimum range was generally from 20-30.degree. C; a slightly acid medium enhanced growth; with the exception of M. pelagica, which grew better in light and S. atra which grew better in the dark, there was little difference between the growth of the fungi in light and in dark.