Abstract
Tremella anaptychiae, a lichenicolous fungus growing on Anaptychia ciliaris, is described as new. Both morphological and molecular data (DNA sequences from the ITS and 28S regions) are used to characterize and distinguish it from other Tremella s. l. species. Tremella anaptychiae is closely related to T. parmeliarum but comparatively distantly related to other previously recognized lichenicolous species groups.