请教一道语法题

小新和小白9899 · 发表于 2011-4-8 08:00:11

OG12 SC 42
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

我想请问下，逗号后面的部分是不是独立主格结构的用法啊，spawned 和extending都省略了be动词？感谢各位NN 回答哈

请教一道语法题

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