in Morphology of Flowering Plants by
These roots are thick, irregular, hang in air and are devoid of root caps and root hairs. instead they have a covering of dead spongy tissue know as velamen.
related to an answer for: What are epiphytic roots? Give examples.

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  1. Epiphytic roots are aerial roots that develop in some orchids (eg. Vanda, Vanilla) which grow as epiphytes on the branches of trees.
  2. They are also called ‘hygroscopic roots’.
  3. They are whitish in colour and are covered with specialized spongy tissue called            Velamen, by which they absorb moisture from the atmosphere.
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