[in Spanish with English abstract: ] Six species of lichens and lichenicolous fungi are recorded from Atlantic Pyrenees. The parasymbiotic fungus Stigmidium tetrasporum is described. Furthermore Peltigera britannica, Pleospora leptogiicola and Stigmidium degelii are recorded as new from meridional Europe. Key-words: Lichens - Lichenicolous fungi - Pyrenees - New records.