Abstract Background Mesoplastics (5–25 mm) and microplastics (0.001–5 are emerging pollutants of great concern. However, reliable methods monitoring these types plastic in river ecosystems have not yet been established. The goal this work was to evaluate, for the first time, suitability Fontinalis antipyretica as a biomonitor meso- micro-plastics rivers. With aim, native samples moss devitalize...