Goniopteris yaucoensis, synonym Thelypteris yaucoensis, [1] is a rare species of fern known by the common name Puerto Rico maiden fern.

[2] It is endemic to Puerto Rico, where it is known from only three localities.

It is a federally listed endangered species of the United States.

At that time it was known to exist at three locations: two in Yauco and one in Ciales in Puerto Rico.

[3] This terrestrial fern has fronds up to 52 centimeters long with the blades divided into 13 to 15 pairs of segments.