Franz Kolb (fl. 1880s) was a German pharmacist and the inventor of the modeling paste Plastilin. In English-speaking countries this material is also known as "plasticine." Because of different patent rights in Germany and England there are different views about who actually invented plasticine. In England, William Harbutt is seen as the inventor, while in Germany it is Franz Kolb. Kolb's German patent is from 1880 while Harbutt's English one is from 1897. The exact formulation of the two products is different.
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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