Brough Holm is a small island off Unst, in the North Isles of Shetland. It is off Westing, which as the name implies is on the west coast of Unst.
The word "brough" refers to the remains of the broch on it.
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60°43′56″N 0°57′47″W / 60.73222°N 0.96306°W
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