[2] This fern has fronds up to 80 centimetres (31 inches) long, each with a hairy, orange brown stipe.

The rachis is hairy and the leaf is divided into a few elongated leaflets.

[2] When this plant was placed on the United States' Endangered Species List it was known from a population of 23 individuals in Arecibo, Puerto Rico.

The ferns are located about 200 metres (220 yards) away from the Arecibo Radio Telescope.

[2] Later more individuals were discovered in Río Abajo Commonwealth Forest and in the municipality of Florida.