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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.
Multiple-stem trees such as banyan can be enormous. Thimmamma Marrimanu in India spreads over 1.0 ha (2.5 acres). The largest organism in the world, according to mass, is the aspen tree whose colonies of clones can grow up to five miles long.