Thamnolia papelillo is a species of whiteworm lichen in the family Icmadophilaceae.

It was described as a new species in 2004 by Norwegian lichenologist Rolf Santesson.

It is found in Peru, where it grows on grazed grass steppe.

Until Santesson's publication, it had been considered a variety of Thamolia vermicularis.

It differs from T. vermicularis in having flat and wide podetia and a distribution restricted to South America.