Ayu or AYU may refer to:
- Ayu (given name)
- Ayu sweetfish (Plecoglossus altivelis), a species of smelt
- Ayu, a local name for the African manatee
- Ayu (singer) or Ayumi Hamasaki, Japanese singer
- Ayu Islands, a small archipelago in Indonesia
- Ayu, Dawei, a village in Burma
- Ayu language, a language of Nigeria
- Aiyura Airport, IATA code AYU
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction