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.
换个角度理解,a giant fungus做organism的同位语,that is紧跟着解释这个fungus,也就是说逗号后面是个同位语从句
这个从句中主语是 that,指代fungus,系动词is,表语filigree,然后接了三个插入语修饰filigree
插入语1:of mushrooms and rootlike tentacles,介宾短语,表明filigree的属性,是一种M和RT
插入语2:spawn by a single fertilized spore,意思是由单个受精卵产卵,由by的提示可知filigree是被spore受精的, 而不是主动去射精的。所以跟filigree只能是动宾关系,用V-ed形式连接
插入语3:extend for more than 30 acres,意思是延伸出去30亩。 filigree不可能被延伸出去30亩,只能是自己主动延伸出去30亩,所以filigree和extend的关系是主谓关系,用V-ing形式连接。