aboveground roots. Usually adventitious in nature and sometimes having unique adaptive functions.

aerial roots (Wikipedia)
The Grey Mangrove (Avicennia marina)'s pneumatophorous aerial roots
A Schefflera arboricola indoor bonsai soon after branch pruning to show extensive aerial roots.
Banyan tree of undetermined species in Fort Myers, Florida
European Beech with aerial roots in a wet Scottish Glen.
Indian banyan Tree in Kodungallur Temple, Kerala, India

Aerial roots are roots above the ground. They are almost always adventitious. They are found in diverse plant species, including epiphytes such as orchids, tropical coastal swamp trees such as mangroves, the resourceful banyan trees, the warm-temperate rainforest rata (Metrosideros robusta) and pohutukawa (M. excelsa) trees of New Zealand and vines such as Common Ivy (Hedera helix) and poison ivy (Toxicodendron radicans).

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