South-eastern Brazil, from Minas Gerais and Espírito Santo south to Rio Grande do Sul.
 
Population
Estimated population is unknown (2010) and decreasing.
Status NT
Habitat destruction and degradation owing to expansion of pasture and cultivation is the main threat.
For more information see BirdLife International Species Factsheet.
Serra do Mar Tyrannulet (Phylloscartes difficilis) [XC538912]
by GABRIEL LEITE from RPPN Fazenda Ren\u00f3polis, Santo Ant\u00f4nio do Pinhal, S\u00e3o Paulo, Brazil (song)
Serra do Mar Tyrannulet (Phylloscartes difficilis) [XC506621]
by Caio Brito from Estrada das Agulhas Negras, Parque Nacional Itatiaia, Itamonte, Minas Gerais, Brazil (call)