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Polystichum calderonense
Also called Monte Guilarte Holly Fern, Monte Guilarte Shield Fern
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 Guilarte State Forest. 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.
Christmas fern · Hard shield-fern · Aleutian holly fern · Harsh Shield Fern · Polystichum bonapartii · Braun's hollyfern · Polystichum bulbiferum · California swordfern · Madeira Shield-Fern · Dudley's swordfern · Polystichum fallax · Narrowleaf swordfern
Text excerpted from the Wikipedia article Polystichum calderonense by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
