A preliminary study was carried out to determine the feasibility of growing two model fungal organisms as biofilms in bioreactors in which the biofilm was supported on novel capillary membranes which have no external skin, and thus allow high transmembrane flux. The fungi used were Trametes versicolor and Neurospora crassa. Biofilm morphology and extracellular enzyme production were monitored. The removal from the bioreactor feed of a model pollutant, p-cresol, by T. versicolor was investigated, and results indicated that the cresol was removed from the solution.