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High Quality Content by WIKIPEDIA articles! The largest organism found on earth can be measured using a variety of methods. It could be defined as the largest by volume, mass, height, or length. Some organisms group together to form a superorganism, though this cannot truly be classed as one large organism. (The Great Barrier Reef, the world's largest coral reef (stretching 2,000 km) has been shown to be a collection of many organisms). The Aspen tree (Populus tremuloides) forms large stands of genetically identical trees (technically, stems) connected by a single underground root system. These trees form through root sprouts coming off an original parent tree, though the root system may not remain a single unit in all specimens. The largest known fully-connected Aspen is a grove in Utah nicknamed Pando, and some experts call it the largest organism in the world, by mass or volume. It covers 0.43 km2 (106 acres) and is estimated to weigh 6,600 short tons (6,000 t). A giant fungusof the species Armillaria ostoyae (honey mushrooms) in the Malheur National Forest in Oregon was found to span 8.9 km2 (2,200 acres), which would make it the largest organism by area. Whether or not this is an actual individual organism, however, is disputed: some tests have indicated that they have the same genetic makeup, but unless its mycelium is fully connected, it is a clonal colony of numerous smaller individuals. Another clonal colony that rivals the Armillaria and the Populus colonies in size is a strand of the giant marine plant, Posidonia oceanica, discovered in the Mediterranean Sea near the Balearic Islands. It covers a band roughly 8 km (4.3 miles) in length.