Monte Guilarte Hollyfern

Description

Polystichum calderonense is a rare species of fern known by the common name Monte Guilarte hollyfern. It is endemic to Puerto Rico, where it occurs in the Pe-uelas and Guilarte Commonwealth Forests. There are only 57 individual plants remaining. It is a federally listed endangered species of the United States.This evergreen terrestrial fern grows in mountains of volcanic origin. It is known from only two locations, one in a forest which is privately owned and another on public land that may be vulnerable to inadequate forest management practices