Abstract: Two species of lichenized ascomycetes (Caloplaca epitoninia, Teloschistaceae, and Helocarpon corticolum, Helocarpaceae) from Tenerife (Canary Islands) are described as new. Caloplaca epitoninia is a specific parasite/parasymbiont on Toninia aromatica, hitherto known only from a single locality, and Helocarpon corticolum seems to be frequent on tree stems in laurel forests.