Microsorum thailandicum: The Iridescent Blue Oil Fern

Microsorum thailandicum Boonkerd and Noot, commonly known as the Blue Oil Fern, is an epiphytic fern renowned for its stunning, iridescent foliage. The leathery, strap-like fronds exhibit a metallic blue sheen on the upper surface, while the underside displays a dull bluish-green hue. Sporangia are borne on the upper quarter to third of the frond's underside, adding to its unique appearance.
Unique Characteristics of Microsorum thailandicum
 
Iridescent Foliage: The metallic blue leaves shift in color under different lighting, giving the fern a mesmerizing effect.
 
Epiphytic Growth: Grows naturally on trees or rocks, absorbing moisture and nutrients from the air and surrounding environment.
 
Compact and Manageable: Unlike many ferns, this species stays relatively small, making it ideal for terrariums, vivariums, or indoor plant collections.
What You Need to Know About Microsorum thailandicum
 
Natural Habitat: Native to Thailand, where it thrives in humid, shaded forest environments.
 
Growth Habit and Size: Grows as a slow-spreading epiphyte, with fronds reaching up to 30 cm in length.
 
Toxicity: Considered non-toxic to humans and pets, making it a safe choice for homes with animals.
 
Lifecycle: A long-living perennial fern that can thrive for years under proper conditions.
How to Care for Microsorum thailandicum
 
Light: Prefers bright, indirect light or dappled shade. Too much direct sun can cause leaf damage.
 
Watering: Keep the substrate consistently moist but not waterlogged. Avoid letting it dry out completely.
 
Humidity: Requires high humidity (70%+). Ideal for terrariums, greenhouses, or humid indoor spaces.
 
Temperature: Best grown in temperatures between 18°C and 27°C. Avoid exposure to cold drafts or sudden temperature drops.
 
Soil: Prefers an airy, well-draining mix of sphagnum moss, orchid bark, and perlite for moisture retention without waterlogging.
 
Repotting: Rarely needs repotting; refresh substrate every couple of years to maintain aeration and nutrients.
 
Fertilization: Feed with diluted orchid fertilizer once a month during the growing season.
 
Propagation: Can be propagated by rhizome division; ensure each section has at least one healthy frond.
 
Semi-Hydroponics: Adaptable to semi-hydroponic setups if provided with high humidity and good air circulation.
 
Pruning: Remove dead or damaged fronds to encourage fresh growth.
Common Problems and Solutions for Microsorum thailandicum
 
Pests: Rarely affected by pests, but may occasionally attract spider mites in dry conditions. Increase humidity and rinse fronds with water if needed.
 
Root Rot: Overwatering can lead to rhizome rot. Ensure the plant is in a well-draining medium and avoid standing water.
 
Leaf Curling or Browning: Usually a sign of low humidity or excessive light. Adjust care conditions accordingly.
 
Fungal Issues: Poor air circulation can lead to fungal infections. Ensure good ventilation and avoid overly wet conditions.
Additional Notes on Microsorum thailandicum
Due to its unique metallic-blue sheen, Microsorum thailandicum is often used in ornamental displays and exotic plant collections. The fern thrives in terrariums or enclosed environments where humidity remains consistently high. Regular misting and a well-maintained environment will ensure it flourishes.
Etymology of Microsorum thailandicum
The genus name Microsorum is derived from the Greek words "mikros" (meaning small) and "sorus" (referring to the spore-producing structures in ferns). The species name thailandicum reflects its origin in Thailand, where it was first documented.
Frequently Asked Questions About Microsorum thailandicum
 
Is Microsorum thailandicum difficult to care for? No, as long as it is provided with high humidity and consistent moisture, it is relatively low-maintenance.
 
Can this fern grow in low light? It prefers indirect light but can tolerate lower light levels. Growth may slow in dim conditions.
 
Does Microsorum thailandicum need soil? Not necessarily; as an epiphyte, it can be mounted on wood or grown in sphagnum moss.
Why Add Microsorum thailandicum to Your Collection?
With its mesmerizing blue iridescence and compact growth habit, Microsorum thailandicum is an extraordinary addition to any plant collection. Its adaptability to terrarium environments and humidity-loving nature make it a unique and rewarding fern to grow.