Naiadia zygoseta (S.Y.Wong, S.L.Low & P.C.Boyce) S.Y.Wong & P.C.Boyce

• Genus: Naiadia
• Botanical Background: First described as Aridarum zygosetum (2014), reassigned to monotypic genus Naiadia in 2018 by Wong & Boyce, reflecting refined generic delimitations within Schismatoglottideae

• Geographical Range: Native exclusively to low‑elevation granite outcrops in Kalimantan (Indonesian Borneo)
• Environment: Rheophytic herb thriving on damp granite ledges within tropical rainforest gullies; experiences high humidity (>80%), constant moisture from splash‑spates, and shaded to semi‑shaded conditions.

Leaves

• Flat, bilobed, oblong leaves (~5–10 cm long) with distinct silvery transverse banding on dark green

Inflorescence (Spadix & Spathe)

• Small pale spathe enclosing a short spadix
• Late staminate anthesis exposes staphylinid beetles for pollination
• Scent reportedly faint, insect‑attracting

Growth Habit

• Terrestrial to lithophytic rheophyte with creeping rhizome
• Lacks tubers
• Forms loose mats on rock surfaces

Light Requirements

• Bright right, indirect light
• Avoid direct sun to prevent leaf scorch

Watering & Humidity

• Maintain constant moisture without waterlogging
• Mimic stream splash with frequent misting
• Humidity ≥75%

Soil & Potting Mix

• Fast‑draining mix of orchid bark, perlite, and peat
• Use shallow container to support lithophytic habit

Temperature & Fertilizer

• Ideal range 20–28 °C
• Feed weak balanced fertilizer monthly during active growth

Division

• Rhizome division is straightforward—ensure each segment has ≥2 leaves

Seeds

• Rarely cultivated from seed
• Viability low and germination conditions poorly documented

Typical Issues

• Susceptible to root rot if overwatered
• Watch for spider mites and mealybugs in dry conditions

Treatment Recommendations

• Improve drainage
• Use neem oil or insecticidal soap for pests
• Fungicide drench (e.g., hydrogen peroxide solution) for early root rot

• As a rheophyte, seeds are dispersed by rain splash—an adaptation called “splash‑cup dispersal.”

  
  

• Valued by collectors for its rarity, unique leaf pattern, and compact habit ideal for terraria and paludaria

Wild Population Status

• No formal IUCN assessment
• Habitat specificity and deforestation in Borneo suggest potential vulnerability

Market Availability

• Rare in commercial trade
• Available through specialist aroid nurseries and private collectors