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growin wrote: Oh S@%$^&! I think this thread is going down the toilet. grlwonder, is it going down clock-wise or counter-clockwise for you? I believe this is the cut-off top stem of the Beaucarnea when it was imported, grown on in a greenhouse/nursery setting and the stem fell to the side of the Beaucarnea. It has since grown moss & mold in it's place on/in the soil alongside the beaucarnea. This is my final answer. Take a look at this page: http://www.gardenstew.com/about20593.html and down the page you'll see a dead stem of a Beaucarnea. Look familiar? It's spongy too. Take a look at this cross-section of a Beaucarnea http://instagram.com/p/KkvkzYG7ZC/ clearly showing the cambium layer/bark, which typically shrivels up and falls off, and the inner sapwood & heartwood which remain. The heartwood is spongy on Beaucarnea just like a Yucca.
Eventually it will begin to grow and look like the plant pictured below.