Colsay is an uninhabited island off the South West coast of Mainland, Shetland. Fora Ness lies to the south, across the Muckle Sound. The highest elevation is 44 metres (144 ft), and there is an ancient cairn on the summit.
It is in Dunrossness parish, 8 miles (13 km) NNW of Sumburgh Head. It used to pasture a good many sheep mostly Cheviot/Shetland cross breeds, which were transported to the island by small boats, called Yoals, from the nearby Spiggie Beach, and landed at the only decent landing place on the island, called the "Owsin Gaet".
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59°57′06″N 1°21′23″W / 59.95167°N 1.35639°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