ABSTRACT: The monotypic ascomycete genus Trematosphaeriopsis is reinvestigated and accepted as a separate genus. It is founded on the lichenicolous, gall-inducing species Trematosphaeriopsis parmeliana, which grows exclusively on Xanthoparmelia species. Originally known only from Asia, it is reported here also from Europe, Africa, North and South America.

KEYWORDS: Lichenicolous Ascomycotina, Xanthoparmelia, taxonomy

NOMENCLATURAL NOVELTIES:
None.