Elaphoglossum pattersoniae is a very rare species of fern that is native to Peru and Bolivia.

[1] It is very close to E. guamannianum, but is smaller in size, its blade apex is acute-obtuse, it lacks dark arachnidoid scales on its abaxial costa and has fewer blade scales.

[2] It is named after Juliet Patterson, a New York Botanical Garden collaborator.

Its rhizome is compact and horizontal; its scales linear and a lustrous red-brown in colour, about 4 millimetres (0.16 in) in size.

Its veins are at a 55-60° angle, and hydathodes are lacking.