Elaphoglossum pattersoniae is a very rare species of fern that is native to Peru and Bolivia. 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.[1] 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 4mm in size. Phyllopodia are present, with fasciculate fronds which are between 6cmand16cmcm (02inchesand06inchescm) long and between 1.2cmand1.8cmcm (00.5inchesand00.7inchescm) broad. Its scales are between 1mm2mm. Its veins are at a 55-60° angle, and hydathodes are lacking. Its costal scales are of an orange-tan colour and it lacks intersporangial scales.