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The Congregation for Borders (Congregazione dei Confini) was a congregation of the Roman Curia. It was set up by Pope Urban VIII in his apostolic constitution Debitum pastoralis officii on 1 October 1627 to oversee the borders of the Papal States. It was suppressed in 1847.
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