Prop roots grow vertically downwards from aerial branches.On reaching the soil these roots grow stouter like pillars supporting the aerial branches. They are also called Pillar roots.

Example: Banyan Tree (Ficus bengalensis)

The Great Banyan Tree (Ficus benghalensis L.) 
The largest banyan tree located in the Indian Botanical Garden, Howrah, West Bengal over 2800 prop roots.
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