Pothos cuspidatus Alderw.

• Genus: Pothos
• Botanical Background: Described by Cornelis R. W. K. van Alderwerelt (Alderw.) in 1922, this species has received limited study outside specialist aroid literature.

• Geographical Range: Native to the wet tropical rainforests of western New Guinea.
• Environment: Grows in low‑light understories on tree trunks and branches. Prefers consistently high humidity, rich organic soils, and warm, stable temperatures.

Leaves

• Glossy, lanceolate
• Measuring 8–15 cm long
• Pronounced pointed tip and smooth margins

Inflorescence (Spadix & Spathe)

• Small, pale green spathe enclosing a cream‑colored spadix
• Likely pollinated by small flies or beetles
• No strong scent reported

Growth Habit

• A climbing, non‑tuberous vine that roots at nodes

• Maintains a slender rhizome near the stem

Light Requirements

• Bright, indirect light

• Tolerates lower light but with slower growth

Watering & Humidity

• Water when the top 2 cm of soil dries

• Maintain humidity above 60 percent

Soil & Potting Mix

• Use a well‑draining mix of peat, perlite, and orchid bark

• A pot with drainage holes is essential

Temperature & Fertilizer

• Ideal range 18–29 °C

• Feed monthly during spring and summer with a balanced liquid fertilizer

Division

• Division of clumps at the rhizome is also effective

Stem Cuttings (if applicable)

• Best propagated by stem cuttings with at least one node, placed in water or moist substrate

Seeds

• Rarely used

• Seeds require warm, moist conditions and may take several weeks to germinate

Typical Issues

• Spider mites, mealybugs, and scale

• Avoid overwatering to prevent root rot

Treatment Recommendations

• Wipe leaves with soapy water or neem oil

• Apply insecticidal soap or systemic insecticide for severe infestations
• Improve air circulation to deter fungal issues

• Epithet “cuspidatus” refers to its sharp leaf tip
• Its discreet blooms make it primarily valued for foliage

• Rare in cultivation,
• Has appeals to collectors seeking true Pothos vines with unique narrow leaves

Wild Population Status

• Not assessed by IUCN
• Habitat loss from logging may pose future risks

Market Availability

• Occasionally offered by specialty nurseries and aroid collectors

• Generally considered uncommon