THE ENIGMATIC DEVONIAN FOSSIL PROTOTAXITES IS NOT A ROLLED-UP LIVERWORT MAT: COMMENT ON THE PAPER BY GRAHAM ET AL. (AJB 97: 268-275).

The authors comment on the article "Structural, Physiological, and Stable Carbon Isotope Evidence That the Enigmalic Paleozoic Fossil Prototaxites Formed From Rolled Liverwort Mats," by L. E. Graham and colleagues, published in the 2010 issue. They describe the anatomy of Prototaxites, along with the problems with the anatomical comparisons presented in the article. They note the obstacles related to the rolling mat hypothesis on Prototaxites. The authors also argue against the article's carbon isotope analysis.