The higher number of FBs per dig found in nests could also be related to enhanced fruiting initiation. Nest installation creates an abrupt discontinuity in the bulk soil/substrate interface. Pacioni et al. (2014)6 hypothesised that fruiting initiation is triggered by a change in soil environment, which has already been found for other fungi9. In our study, the different magnitude of the nest effect on each soil supports this hypothesis. Moskal et al. (2001)28 reviewed the effect of peat amendments to soil and concluded that the increase in available water was more marked for sandy than clayey soils.