lithophyte

1. Botany. A plant that grows on rock and derives its nourishment chiefly from the atmosphere.
2. Zoology. An organism, such as coral, that has a stony structure.

A plant that grows on rock and derives its nourishment chiefly from the atmosphere. For example, lichens and some orchids are lithophytes.

The noun has one meaning:

Meaning #1: plant that grows on rocks or stony soil and derives nourishment from the atmosphere
  Synonym: lithophytic plant

Nepenthes sp. growing as a lithophyte in Raja Ampat, New Guinea

Lithophytes are a type of plant that grows in or on rocks. Lithophytes feed off moss, nutrients in rain water, litter, and even their own dead tissue.

Examples of lithophytes include several Paphiopedilum orchids, the pitcher plant Nepenthes campanulata, and several Utricularia species.

Button Orchid, Elkhorn fern, Birds Nest Fern and moss growing on Hawkesbury Sandstone at Chatswood West, Australia

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