Hypotrachyna mcmulliniana is a species of foliose lichen in the family Parmeliaceae.

[1] It has a blue-grey thallus about 3-10 cm wide, with lobes 1.0–4.0 mm wide, and isdia without hairs.

[1] This lichen grows on conifers, hardwood trees and shrubs, and rocks.

[1] The conservation status of the lichen has not been ranked.

[2] This species was described in 2020, and was named to honor R. Troy McMullin, a lichen researcher and educator at the Canadian Museum of Nature, in honor of his work to describe and share lichen biodiversity in well-studied, often disturbed areas.