Monte Guilarte Holly Fern / Center For Plant Conservation
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Plant Profile

Monte Guilarte Holly Fern (Polystichum calderonense)

Photo Credit: Omar Monsegur
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: Federally Endangered
  • Family: Dryopteridaceae
  • State: PR
  • Nature Serve ID: 134377
  • Lifeform: Forb/herb
  • Categories of Interest: Ferns
  • Date Inducted in National Collection:

Polystichum calderonense is a rare species of fern known by the common name Monte Guilarte hollyfern. Polystichum are terrestrial or rock-dwelling ferns of warm-temperate and montane tropical regions. Adult specimens are medium in size and reach 3-6 feet high. They have stout, slowly-creeping rootstocks that form a crown, with a vase-like ring of evergreen fronds. The primary reasons for endangerment include habitat loss, fires, poor forestry management practices

Where is Monte Guilarte Holly Fern (Polystichum calderonense) located in the wild?


cool, mossy ledges; partial shade



States & Provinces:

Monte Guilarte Holly Fern can be found in Puerto Rico

Which CPC Partners conserve Monte Guilarte Holly Fern (Polystichum calderonense)?

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

Nature Serve Biotics
  • 05/02/2017

Only two populations and a total population of 57 individuals.

  • 01/01/2010

clearing, individuals, private individuals encroaching into forest (Calderon)

  • 01/01/2010

60 plants total in 2 sites (La Silla de Calderon, Adjuntas; Cerrote de Penuelas, Penuelas) 57 individuals in 2 populations at 2 sites

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Taxon Polystichum calderonense
Authority Proctor
Family Dryopteridaceae
CPC Number 9870
ITIS 504527
Duration Perennial
Common Names Christmas Fern | Monte Guilarte hollyfern
Associated Scientific Names Polystichum calderonense
Distribution NA
State Rank
State State Rank
Puerto Rico
Ecological Relationships

Lead Institution State Reintroduction Type Year of First Outplanting
Fairchild Tropical Botanic Garden Puerto Rico Reintroduction 2021+2022
Fairchild Tropical Botanic Garden Puerto Rico Reintroduction 2022
Fairchild Tropical Botanic Garden Puerto Rico Reintroduction 2022
Fairchild Tropical Botanic Garden Puerto Rico Reinforcement/Augmentation 2022

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