Bear's Paw Fern

Aglaomorpha coronans is native to tropical and subtropical regions of South and Southeast Asia, including parts of India, Myanmar, Thailand, Malaysia, Indonesia, southern China, and the Philippines.

• Typically found in lowland to mid-elevation tropical forests
• Grows as an epiphyte on tree trunks and branches, or occasionally as a lithophyte on rock surfaces
• The genus Aglaomorpha comprises approximately 50 species, primarily distributed across tropical Asia and Australasia
• Fossil and molecular evidence suggests the Polypodiaceae family diversified during the Cretaceous period, coinciding with the rise of angiosperm-dominated forests that provided new epiphytic niches
• In traditional Chinese and Southeast Asian horticulture, Aglaomorpha species have long been grown mounted on wooden plaques or in hanging baskets

The Bear's Paw Fern is a large, robust, evergreen epiphytic fern notable for its dimorphic fronds — it produces two distinctly different types of fronds.

Rhizome & Stipes:
• Rhizome is thick, creeping, and densely covered with brown, lanceolate scales
• Rhizome can grow up to 2 cm in diameter and extends along the host substrate
• Stipes (leaf stalks) are stout, winged, and can reach 15–30 cm in length
• The rhizome accumulates organic debris and humus, forming a natural "nest" structure that retains moisture and nutrients

Sterile Fronds (Nest Fronds):
• Broadly rounded to reniform (kidney-shaped), 15–40 cm across
• Brown, stiff, and papery in texture
• Persistent — they do not wither but remain attached, forming a basket-like nest at the base of the plant
• Function to trap falling leaf litter, moisture, and organic debris, creating a self-sustaining nutrient reservoir
• These nest fronds are the origin of the common name "Basket Fern"

Fertile Fronds (Bearing Fronds):
• Deeply pinnatifid with long, finger-like lobes radiating outward — resembling a bear's paw
• Can grow 60–120 cm long (occasionally up to 2 meters) and 20–40 cm wide
• Bright green, leathery texture
• Lobes are typically 5–12 in number, strap-shaped, with rounded tips
• The dramatic, paw-like silhouette makes this one of the most recognizable ferns in cultivation

Sori:
• Sori are round to oval, arranged in one or two rows on either side of the midvein on the underside of fertile fronds
• Lack indusia (protective covers)
• Sporangia are mixed with club-shaped hairs (paraphyses)
• Spores are yellowish-brown, monolete, and released when mature

Aglaomorpha coronans is an epiphytic fern that thrives in warm, humid tropical and subtropical forest environments.

• Typically grows on the trunks and large branches of trees in dense forests, 1–10 meters above the ground
• Occasionally found as a lithophyte on mossy rock faces and cliff crevices
• Prefers dappled to semi-shaded light conditions beneath the forest canopy
• The nest fronds play a critical ecological role: they trap organic debris, forming a miniature ecosystem that supports invertebrates, fungi, and microorganisms
• These trapped decomposing materials provide the fern with nutrients, an adaptation to its epiphytic lifestyle where soil is absent
• Requires consistently high humidity (ideally 60–80%) and warm temperatures
• Does not parasitize its host tree — it uses the tree only for physical support
• Spores are wind-dispersed and require moist, shaded conditions to germinate into prothalli
• Like all ferns, fertilization requires a film of water for motile sperm to reach the egg

The Bear's Paw Fern is a rewarding but space-demanding houseplant. Its large fronds and epiphytic growth habit make it best suited for mounting on wood or growing in hanging baskets rather than conventional pots.

Light:
• Bright indirect light or dappled shade
• Avoid direct sunlight, which can scorch the fronds
• Tolerates lower light than many ferns but growth will slow

Humidity:
• Prefers high humidity (60–80%)
• Benefits from regular misting or placement near a humidifier
• Tolerates lower humidity better than many delicate ferns (e.g., Adiantum), but frond tips may brown in very dry air

Soil & Mounting:
• Best grown mounted on cork bark, tree fern plaques, or wooden boards with a pad of sphagnum moss around the rhizome
• Alternatively, grown in very loose, well-draining epiphytic mix: orchid bark, perlite, and sphagnum moss
• The rhizome should not be buried — it must remain on the surface or be secured to the mounting material
• The nest fronds should be left intact; do not remove them even when they turn brown

Watering:
• Water thoroughly when the mounting medium or potting mix begins to dry
• Mounted plants benefit from soaking the entire mount in water for 10–15 minutes
• Reduce watering in winter but never allow the plant to dry out completely
• The nest fronds help retain moisture around the rhizome

Temperature:
• Optimal range: 18–28°C
• Minimum tolerable temperature: ~10°C; prolonged cold causes damage
• Protect from cold drafts and heating vents

Propagation:
• Division of the rhizome, ensuring each division has both nest fronds and fertile fronds
• Spore propagation is possible but slow — spores germinate in moist, sterile conditions over several weeks

Common Problems:
• Brown frond tips → low humidity or inconsistent watering
• Yellowing fronds → overwatering, poor drainage, or insufficient light
• Scale insects and mealybugs — common pests on the thick rhizome and frond bases
• Rhizome rot — caused by burying the rhizome or keeping it in waterlogged conditions