Pseudocyphellaria brattii is a species of foliose lichen in the family Peltigeraceae.

It was described as new to science in 1997 by lichenologists David John Galloway and Gintaras Kantvilas.

Dundas Track (Tasmania), where it was found growing on dead wood in a rainforest at an altitude of 700 m (2,300 ft).

The specific epithet honours Tasmanian lichenologist Geoffrey Charles Bratt, who, according to the authors, "helped to keep Australian lichenology alive during the 'lean years'".

It typically grows in deep shade on logs, or on plants.