Rudolf I may refer to:
- Rudolf I (bishop of Würzburg) (died 908)
- Rudolph I of Burgundy (859–912)
- Rudolf I, Margrave of the Nordmark (d. 1124)
- Rudolph I, Count Palatine of Tübingen (1160–1219)
- Rudolph I, Bishop of Schwerin (died 1262)
- Rudolf I, Margrave of Baden-Baden (1230–1288)
- Rudolf I of Germany (1218–1291)
- Rudolf I, Duke of Bavaria (1274–1319)
- Rudolf I of Bohemia, (c. 1281 – 1307)
- Rudolf I, Margrave of Hachberg-Sausenberg (died 1313)
- Rudolf I, Duke of Saxe-Wittenberg, (c. 1284 – 1356)
- Rudolf II, Holy Roman Emperor (1552–1612), who was also Rudolf I of Hungary
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