Give it a slab and humidity, and a juvenile lance leaf splits into a meter-wide pinnate sail.
Found from the eastern Himalayas through southern China and into Vietnam, where it ascends rainforest trunks on thick adhesive roots. Juvenile leaves are simple lances; mature foliage pinnatifies dramatically, with deep splits and individual segments running 30–60 cm long. It needs vertical real estate — a tall moss pole or cedar slab — to trigger the morph. Without something to climb, it sulks and stays juvenile indefinitely.
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