Kangaroo Paw Fern

Microsorum diversifolium is native to Australia, where it is found primarily in the eastern coastal regions of Queensland and New South Wales.

• Occurs in tropical and subtropical rainforests, often growing as an epiphytic fern attached to tree trunks and branches
• Also found colonizing rocky outcrops, cliff faces, and boulder fields in humid forest environments
• Extends into temperate zones along sheltered coastal gullies
• The genus Microsorum is broadly distributed across tropical and subtropical regions of Africa, Asia, and the Pacific Islands

The Kangaroo Paw Fern is a perennial evergreen fern with a creeping rhizome and dimorphic fronds (sterile and fertile fronds differ in shape).

Rhizome & Stipes:
• Rhizome is thick, fleshy, and creeping, densely covered with dark brown to black lanceolate scales (~5–10 mm long)
• Rhizomes spread horizontally, anchoring the fern to bark, rock, or soil surfaces
• Stipes (leaf stalks) are short to moderately long, smooth, and lack prominent scales

Fronds (Sterile):
• Simple, entire (undivided), broadly elliptic to oblong in shape
• Typically 10–30 cm long and 3–8 cm wide
• Texture is thick, leathery, and glossy bright green
• Margins are entire (smooth, without lobes or teeth)
• Prominent midrib visible on the underside

Fronds (Fertile):
• Deeply pinnatifid (pinnately lobed) with narrow, finger-like segments
• These lobed fertile fronds are the source of the "kangaroo paw" common name
• Sori (spore-producing clusters) are arranged in rows along the lobes

Sori:
• Round to oval, arranged in one or two rows between the midrib and margin on fertile fronds
• Lack an indusium (protective covering) — a characteristic feature of the genus Microsorum
• Cinnamon-brown when mature, producing abundant spores

The Kangaroo Paw Fern inhabits humid, sheltered microenvironments in tropical and subtropical ecosystems.

• Primarily grows as an epiphyte on tree trunks and branches in rainforests
• Also lithophytic — colonizing rock faces, boulders, and cliff crevices
• Prefers dappled shade to semi-shade; avoids prolonged direct sunlight
• Thrives in areas with high atmospheric humidity and consistent moisture
• Found from coastal lowlands to montane forests at moderate elevations
• Tolerant of brief dry periods due to its thick, leathery fronds that reduce water loss

Reproduction:
• Spores are released from mature sori and dispersed by wind
• Spores germinate on moist surfaces into heart-shaped prothalli
• Fertilization requires a film of water for motile sperm to reach the egg
• New fern plants develop from the fertilized embryo on the prothallus

The Kangaroo Paw Fern is considered one of the more adaptable and forgiving ferns for indoor and outdoor cultivation, particularly in subtropical and warm-temperate climates.

Light:
• Bright indirect light to dappled shade
• Tolerates lower light levels than many ferns
• Avoid prolonged direct afternoon sun, which can scorch fronds

Soil/Substrate:
• Well-draining, loose growing medium rich in organic matter
• As an epiphyte, it thrives mounted on bark, cork, or tree fern plaques
• For potting: use a mix of orchid bark, perlite, and peat-based medium
• Must not sit in waterlogged soil

Watering:
• Keep the growing medium consistently moist but not saturated
• Allow the surface to dry slightly between waterings
• Tolerates brief dry spells better than most ferns due to leathery fronds
• When grown as a mounted epiphyte, regular misting is beneficial

Humidity:
• Prefers moderate to high humidity (>50%)
• More tolerant of average indoor humidity than maidenhair ferns and other delicate species
• Occasional misting helps in dry indoor environments

Temperature:
• Optimal range: 15–27°C
• Can tolerate brief periods near freezing but is not frost-hardy
• Protect from cold drafts and sudden temperature drops

Propagation:
• Division of the creeping rhizome is the most reliable method
• Each division should include several fronds and healthy rhizome with roots
• Spore propagation is possible but slow

Common Problems:
• Brown leaf tips → low humidity or underwatering
• Yellowing fronds → overwatering, poor drainage, or too much direct sun
• Scale insects and mealybugs can occasionally infest the rhizome and frond bases
• Relatively pest-resistant compared to many other fern species