Didymocyrtis menegazziae sp. nov., Opegrapha menegazziae sp. nov., Pronectria menegazziae sp. nov., lichenicolous on Menegazzia terebrata and M. subsimilis are described as new; additionally, Stigmidium menegazziae ad int. is sketched. A key to all known lichenicolous taxa on Menegazzia in Europe is presented. Key words: Didymocyrtis, Merismatium nigritellum, Opegrapha, Pronectria, Stigmidium, new species.