Similarly to white-rot mushrooms, Agaricus spp. can also degrade the lignin contained in compost lignocellulosic materials by activating the production and release of ligninases. It has been argued that the main purpose of the lignin degradation is to increase bioavailability of the underlying holocellulose (Ten Have and Teunissen, 2001). A. blazei was informed to have a high lacasse activity during vegetative phase (Ulrich et al., 2005).