An addition to the knowledge of lichenicolous fungi of Greece with a key to the lichenicolous fungi on Collema s.l.
Keywords:lichen-inhabiting fungi, Mediterranean area, Bionectriaceae
Didymellopsis pulposi, Pronectria diplococca, P. pedemontana, Stigmidium hageniae and Tremella anaptychiae are reported as new to Greece. Pronectria diplococca is reported as new to Austria. A key to the lichenicolous fungi on Collema s.l. is provided.