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The sub-prefectures (known in French as sous-prefectures) are the third-level administrative divisions in Guinea. As of 2009 there were 303 rural sub-prefectures of Guinea and 38 urban sub-prefectures, 5 of which compose the Conakry greater urban area; Kaloum, Dixinn, Matam, Ratoma and Matoto.
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