Santa Rosa Fern (Aglaomorpha coronans): Bold, Epiphytic Fern with Nesting Habit

Overview

Santa Rosa fern (Aglaomorpha coronans, syn. Drynaria coronans) is a striking epiphytic fern native to Southeast Asia. It produces two distinct frond types: large, erect, pinnate **fertile fronds** (3–5 feet) that photosynthesize, and smaller, rounded, brown **sterile nest fronds** that clasp the rhizome, collecting debris and moisture—similar to staghorn ferns but with a more open, vase-like habit. The fertile fronds are bold, leathery, and deeply lobed.

Unique Dimorphism

• Nest Fronds: Brown, papery, cup-shaped; form a debris-collecting basket.
• Fertile Fronds: Large, green, deeply pinnatifid; rise above the nest.
• Epiphytic Majesty: Spectacular on large tree trunks or in hanging baskets.

Culture

Bright, indirect light; can tolerate morning sun. Epiphytic mount (cork, tree fern slab) or loose, airy basket mix. Keep moist; high humidity. Warm temperatures; minimum 50°F (10°C). USDA zones 10–11 outdoors. Botanical garden favorite.

Taxonomic Profile

With its dramatic two-frond strategy, Santa Rosa fern is a masterpiece of epiphytic adaptation.