Two lichenicolous fungi are newly reported from Argentina: Myxophora leptogiophila (on Leptogium sp.) and Nectriopsis lecanodes (on Peltigera sp.). Didymellopsis nephromatis, found growing on Nephroma cellulosum, is described as new to science. A list of 60 lichenicolous fungi formerly known from the country is provided. Keywords. – lichen parasites, cyanolichens, South America.