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In 1881, surveyor George Cornthwaite measured a felled tree in Victoria at 114.3 metres. That is about 1m shorter than the world's tallest living tree, a coast redwood measuring 115.5m. If you believe the old record books, and measurement systems, several other trees have reached such extreme heights.
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.