How are vestibular disorders diagnosed? The inner earâs vestibular organs and the associated nerves and brain centers form a complex system that serves many functions and can be affected by a number of outside systems. A thorough evaluation of the inner ear may therefore require several different kinds of tests.
Birch and tea-leaved willow are the main species of tree found in Icelandic woodlands and shrublands. Birch is the only species of tree to form continuous natural woodlands in Iceland, although the occasional rowan or aspen can be found growing in among the birch trees. Mosses and lichens often abound in forests, both as undergrowth and epiphytes growing on trees.
1 Fortingall Yew, an ancient yew (Taxus baccata) in the churchyard of the village of Fortingall in Perthshire, Scotland; one of the oldest known individual trees in Europe. 2  Various estimates have put its age at between 2000 and 5000 years, although these days it is believed to be at the lower end of this range.