Patches of lemon yellow tissue about 1-2mm thick, on bare, dead, barkless nothofagus trunk. Tiny dark spots (ostioles) from which ascospores are released.
In a tall rain forest national park.
This was previously called H sulphurea, the northern hemisphere version but recent work has proven it to be a different species. A wood-rotting ascomycete, which might also colonize some other fungi.