Pontianus may refer to:
- Pontianus of Spoleto, martyr of the 2nd century and patron saint of that city
- Sicinius Pontianus, friend of Apuleius
- Pontianus Africae, 6th-century bishop
- Pontianus of Nicomedia, a character in Deipnosophistae, a 3rd-century work by Athaenaeus
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