A. biennis, F. velutipes, I. andersonii, P. nameko and T. hirsuta strains as well as several Pleurotus spp. reduced OMW phytotoxicity as was evidenced by an increase in ICG-001 germination by approx. 30% in respect to untreated OMW ( Fig. 3). The germination indices after OMW treatment by the wood-rot fungi were negatively correlated to the phenolics content (r = −0.568, p < 0.01) and color (r = −0.525, p < 0.01) ( Table 1). It has been previously reported that phenolics removal can decrease phytotoxicity, but not in a proportional manner ( Tsioulpas et al., 2002). In this evaluation, partial detoxification of OMW was observed under an extended dephenolization regime. This means that other factors, e.g. high organic load, presence of short-chain fatty acids, production of quinonoids during phenol oxidation (in conjunction with the absence of polymers precipitation) and/or the generation of intermediate molecular-mass aromatic compounds ( Aggelis et al., 2002, Dias et al., 2004 and Tsioulpas et al., 2002), could also contribute to the effluent’s toxicity.