North America Native Plant

Eggleaf Bristle Fern

Botanical name: Trichomanes ovale

USDA symbol: TROV3

Life cycle: perennial

Habit: forb

Native status: Native to Puerto Rico  

Eggleaf Bristle Fern: A Rare Puerto Rican Native Worth Knowing Meet the eggleaf bristle fern (Trichomanes ovale), a fascinating native fern that calls Puerto Rico home. While you might not find this little beauty at your local garden center, it’s worth getting to know this unique member of the bristle ...

Eggleaf Bristle Fern: A Rare Puerto Rican Native Worth Knowing

Meet the eggleaf bristle fern (Trichomanes ovale), a fascinating native fern that calls Puerto Rico home. While you might not find this little beauty at your local garden center, it’s worth getting to know this unique member of the bristle fern family.

Where Does It Come From?

The eggleaf bristle fern is exclusively native to Puerto Rico, making it a true island endemic. This perennial fern has evolved specifically in Puerto Rico’s unique climate and conditions, representing an important piece of the island’s botanical heritage.

What Makes It Special?

As its common name suggests, this fern likely gets its eggleaf moniker from the distinctive shape of its fronds. Like other members of the Trichomanes genus, it’s part of the filmy fern family, known for their delicate, often translucent foliage that creates an almost ethereal appearance in the forest understory.

Is It Right for Your Garden?

Here’s where things get interesting – and a bit challenging. The eggleaf bristle fern is quite rare, with limited information available about its specific growing requirements and availability. If you’re gardening in Puerto Rico and happen to encounter this species, consider yourself lucky to witness this botanical treasure in its natural habitat.

A Word of Caution

Due to the apparent rarity of this species and limited information about its conservation status, we strongly recommend against attempting to collect or transplant wild specimens. Instead, appreciate it where it grows naturally and consider supporting local conservation efforts that protect Puerto Rico’s unique fern flora.

Better Alternatives for Fern Lovers

If you’re enchanted by the idea of growing native ferns, consider these more readily available options that are native to your specific region:

  • Look for other native ferns in your local area
  • Visit native plant sales where responsibly propagated ferns are available
  • Connect with local native plant societies for guidance on suitable alternatives
  • Support botanical gardens and conservation organizations working to preserve rare species

The Bigger Picture

While the eggleaf bristle fern might not be destined for your garden bed, it serves as a wonderful reminder of the incredible diversity of native plants that exist in specific regions. Endemic species like this one highlight the importance of protecting natural habitats and supporting conservation efforts that ensure these botanical treasures survive for future generations to discover and admire.

Sometimes the best way to grow a rare plant is to support its preservation in the wild – and that’s a garden philosophy we can all get behind!

Eggleaf Bristle Fern

Classification

Group

Fern

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Pteridophyta - Ferns

Subdivision
Class

Filicopsida

Subclass
Order

Polypodiales

Family

Hymenophyllaceae Mart. - Filmy Fern family

Genus

Trichomanes L. - bristle fern

Species

Trichomanes ovale (Fourn.) W. Boer - eggleaf bristle fern

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA