fistular

Updated: August 7, 2026

In the nature of their stems, too, they exhibited a more highly organised arrangement than their living representatives, having, according to Dr Williamson, a "fistular pith, an exogenous woody stem, and a thick smooth bark." The bark having almost al ways disappeared has left the fluted stem known to us as the calamite.

Edward A. Martin - The Story of a Piece of Coal: What It Is, Whence It Comes, and Whither It Goes