Parmotrema mellissii is a widely distributed species of corticolous lichen in the family Parmeliaceae.

It was first described by Carroll William Dodge in 1959 as a species of Parmelia.

[3] The type collection was made in Saint Helena.

Parmotrema mellissii has a pale yellowish-buff coloured thallus at least 12 cm (5 in) in diameter, comprising rounded lobes about 15 mm wide and long.

[2] It has been found in the southern U.S.A., the Neotropics from Mexico to Colombia and Brazil, Africa (including the Canary Islands and Kenya), Asia (Japan, Laos,[4] the Philippines[5]), Australia and Oceania.