The species was first described as Thysananthus evansii by Margaret Fulford in 1941, publishing the description in the Bulletin of the Torrey Botanical Club.

[3] Fulfordianthus evansii is a small liverwort with irregularly branching stems that grow up to 2 cm (0.79 in) long and 2 mm (0.079 in) wide.

The perianth (the protective structure around the developing reproductive organs) is typical for the genus, featuring a small beak-like projection 3–10 cells long.

[3] Fulfordianthus evansii grows as an epiphyte on tree trunks in undisturbed lowland rainforest of Central America, where it occurs at sea level.

The species has been found in Tortuguero National Park, Costa Rica, and more recently on Barro Colorado Island, Panama, which represents its only known locality in that country.

Historical collections exist from Guatemala's east coast and Belize, though these are older records that have not been recently reconfirmed.