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In the present study, an Ascomycete fungal strain, <i>Lambertella</i> sp., isolated from environmental polluted matrices, was tested for the capacity to reduce the contamination and the toxicity of intermediate and old landfill leachates. Batch tests in flasks, under co-metabolic conditions, were performed with two different old leachates, with suspended and immobilized <i>Lambertella</i> sp. biomass, resulting in a soluble chemical oxygen demand depletion of 70% and 45%, after 13 and 30 days, respectively. An intermediate landfill leachate was treated in lab-scale reactors operating in continuous conditions for three months, inoculated with immobilized <i>Lambertella</i> sp. biomass, in absence of co-substrates. The <i>Lambertella</i> sp. depleted the corresponding total organic carbon by 90.2%. The exploitability of the <i>Lambertella</i> sp. strain was evaluated also in terms of reduction of phyto-, cyto-, and mutagenicity of the different Landfill Leachates at the end of the myco-based treatment, resulting in an efficient depletion of leachate clastogenicity.