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Small white bumps which form on the mainstem near the base of the plant. They are masses of corky cells that allow gas exchange into, and out of, the stem of the plant due to the rest of the 'bark' being impenetrable to gasses used and released in metabolism.
Okay okay okay... just wait tick. You're telling me that these plants get gas? And they must grow multiple 'behind holes' to let it all out? What the hell are you people feeding your poor plants?!?