Tropicals & Tender Perennials: Unusual stem, 1 by JustJen

JustJen wrote:
I'm not sure which brug this is but the stem is odd looking. It looks almost like pull apart licorice. about half way up the main stem, it looks like someone took a hammer to it and flattened it. there is no roundness to the stem at all. before it y'd the whole stem looked the right side. it appears to be growing well, is healthy looking and no sign of disease.
any idea what caused this? i've never seen anything like it
jen