![](https://upload.wikimedia.org/wikipedia/commons/e/eb/Ivan_Vidav_1963.jpg)
Ivan Vidav (January 17, 1918 – October 6, 2015) was a Slovenian mathematician.[1]
Ivan Vidav was born in Villa Opicina near Trieste, Italy. He was a student of Josip Plemelj. Vidav received his Ph.D. with Plemelj as his advisor in 1941 at the University of Ljubljana with the dissertation Kleinovi teoremi v teoriji linearnih diferencialnih enačb (Klein's Theorems in the Theory of Linear Differential Equations).
Vidav's main research interest were differential equations, functional analysis, and algebra. He was a regular member of the Slovenian Academy of Sciences and Arts. He received the Prešeren Award in recognition of his work.
In 1988, he became an honorary member of the Society of Mathematicians, Physicists and Astronomers of Slovenia (DMFA).
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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