ID-1 or ID1 may refer to:
- ID-1 format, the standard "credit card" size for identification cards defined by ISO/IEC 7810
- A gene (inhibitor of DNA binding-1) which controls cancer metastasis
- Idaho's 1st congressional district
ID-1 or ID1 may refer to:
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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