Parmotrema aptrootii is a species of corticolous lichen in the family Parmeliaceae.

The holotype specimen was collected in the Cuyuni-Mazaruni region of Guyana, where it was found growing on a Mahogany tree on the bank of the Kamarang River.

It has a pale yellowish to greenish-grey thallus measuring up to about 10 cm (4 in).

The specific epithet honours Dutch lichenologist André Aptroot.

[1] The lichen has also been recorded from Acre, Brazil, where it is commonly found on dead branches in dense shrubby campinas.