Microsorum pteropus 'Sp. Borneo'

Microsorum pteropus 'Sp. Borneo' is a distinct wild-collected form of Java Fern originating from specific Bornean river localities, distinguished from the garden cultivar 'Sp. Borneo' by its genuinely wild provenance. Plants collected from Borneo tend to have particularly leathery, dark, and more robust fronds than nursery-produced cultivars — adaptations to the fast currents and variable flooding of Bornean stream systems.

In the aquarium this form performs identically to standard Java Fern with the same hardiness and adaptability, but the darker, tougher fronds and more pronounced rhizome give it a slightly different visual character — more natural-looking and suited to biotope aquariums than more uniform cultivars. It is especially well-suited to high-flow Borneo blackwater or clearwater biotope setups.

Care is identical to all Java Fern varieties: attach rhizome to hardscape, provide low to moderate light, fertilise regularly, and avoid burying the rhizome. This form grows slowly but produces impressive, long-lived dark fronds that develop visible sori on their undersides as the plant matures.

Light: Low; 15–35 µmol PAR — the dark, leathery fronds are adapted to dappled forest stream lighting. CO2: Not required; grows naturally in CO2-rich but soft, blackwater-type streams. Fertilisation: Liquid trace elements and micronutrients weekly; iron supports dark leaf pigmentation. Placement: Attach rhizome to large driftwood in midground or background; suits high-flow biotope setups. Propagation: Separate rhizome offshoots or leaf-margin plantlets once well established.