An addition to the knowledge of lichenicolous fungi of Greece with a key to the lichenicolous fungi on Collema s.l.
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.