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Tasmania's giant ash trees may be world's tallest. Stephen Sillett's laboratory is dangling 90 metres above the ground. It is an intricate web of ropes and instruments strung up in the branches of a tree. And in the windy conditions that plague Tasmania's forests, it can be distinctly precarious.
So with that out of the way, the world's longest tree is a Coast Redwood located in Montgomery State Reserve, CA. named the Mendocino Tree. The Mendocino Tree measures in at 367.5 feet with a diameter of 10 feet 4 inches and is estimated to be about 1,000 years old. The Mendocino Tree captured the record after the existing world's longest tree, located in the Redwood National Park, CA., lost 10 feet of it's top in a storm. UPDATE: November17, 2008.