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Friedrich Kasimir Medikus (or Friedrich Casimir Medicus; 6 January 1738 – 8 July 1808) was a German physician and botanist.
He was born at Grumbach and became director of the University of Mannheim (Theodoro Palatinae Mannheim) and curator of the botanical garden at Mannheim. He encouraged the cultivation of locust trees (Robinia) in Europe.
The genus Medicusia was named after him by Conrad Moench (now considered synonymous with Picris).
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