Scientists have recently discovered what could be the largest and oldest living organism on Earth, a giant fungus that is an interwoven filigree of mushrooms and rootlike tentacles spawned by a single fertilized spore some 10,000 years ago and extending for more than 30 acres in the soil of a Michigan forest.
extends会和前面的is错误平行,这样就awkward了( the ostensible parallel between extends and the distant verb is is superficial and would result in an awkward and unclear sentence.)