RHS Rosemoor Gardens in Torrington is offering visitors a special opportunity to meet its likeable lichens.Although everyone will have seen these interesting organisms, on benches, trees and shrubs, few people know how important they actually are. A likeable lichens' walk at Rosemoor will enable people to learn more about this mysterious species.Unlike trees, grasses and flowers, a lichen is not a single plant. It consists of two partners that live together.Lichens provide vital information about the health of the environment and the quality of the air. Rosemoor has more than 100 lichen species in the garden.The 'likeable lichens' walk is taking place on Tuesday, April 8 at 11am, and will be led by Dr Ann Allen, the secretary of the Education and Promotions Committee of the British Lichen Society. To book call (01805) 626800.