founded in 1947, is said to be Scotland's longest-running literary magazine. For much of the later 20th century, it was the major vehicle for the work of local writers — and of others, including early work by George Mackay Brown. Films and television Michael Powell made The Edge of the World in 1937, a dramatisation based on the true story of the evacuation of the last 36 inhabitants of the remote island of St Kilda on 29 August 1930. St Kilda lies in the Atlantic Ocean, west of the Outer Hebrides but Powell was unable to get permission to film there. Undaunted, he made the film over four months during the summer of 1936 in Foula and the film transposes these events to Shetland. Forty years later, the documentary Return to the Edge of the World was filmed, capturing a reunion of cast and crew of the film as they revisited the island in 1978. A number of other films have been made on or about Shetland including A Crofter's Life in Shetland (1932), A Shetland Lyric (1934), Devil's Gate (2003) and It's Nice Up North (2006), a comedy documentary by Graham Fellows. The Screenplay film festival takes place annually in Mareel, a cinema, music and education venue. The BBC One television series Shetland, a crime drama, is set in the islands and is based on the book series by Ann Cleeves. The programme is filmed partly in Shetland and partly on the Scottish mainland. Wildlife Shetland has three national nature reserves, at the seabird colonies of Hermaness and Noss, and at Keen of Hamar to preserve the serpentine flora. There are a further 81 SSSIs, which cover 66% or more of the land surfaces of Fair Isle, Papa Stour, Fetlar, Noss, and Foula. Mainland has 45 separate sites. Flora The landscape in Shetland is marked by the grazing of sheep and the harsh conditions have limited the total number of plant species to about 400. Native trees such as rowan and crab apple are only found in a few isolated places such as cliffs and loch islands. The flora is dominated by Arctic-alpine plants, wild flowers, moss and lichen. Spring squill, buck's-horn plantain, Scots lovage, roseroot and sea campion are abundant, especially in sheltered places. Shetland mouse-ear (Cerastium nigrescens) is an endemic flowering plant found only in Shetland. It was first recorded in 1837 by botanist Thomas Edmondston. Although