Phyllonorycter foliolosi is a moth of the Gracillariidae family. It is known from the Canary Islands. The larvae feed on Adenocarpus complicatus aureus, Adenocarpus foliolosus and Teline canariensis. They mine the leaves of their host plant. They create a strongly contracted, lower-surface tentiform mine. The leaflet is folded lengthwise and completely eaten out. The leaf turns whitish-transparent. Pupation takes place within the mine.