The fungus Armillaria bulbosa is among the largest and oldest living organisms

@article{Smith1992TheFA,
  title={The fungus Armillaria bulbosa is among the largest and oldest living organisms},
  author={Myron L Smith and Johann Nikolaus Bruhn and James B. Anderson},
  journal={Nature},
  year={1992},
  volume={356},
  pages={428-431}
}
ASEXUALLY reproducing organisms occur in a variety of taxa in all biological kingdoms1 and distinguishing asexually propagated genotypes is essential for the understanding of their population biology. Among the higher fungi, however, the clonal 'individual' is especially difficult to define2 because most of the fungal thallus consists of a network of anastamosing hyphae embedded in the substratum. Whether fruit-bodies, the most recognizable part of a fungus, are produced by a single supporting… 
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TLDR
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