Equisetum thermale (image) Botanical Society of America Share Print E-Mail Caption This is a tranverse section of an Equisetum thermale stem. Credit Alan Channing, Cardiff University, Wales, United Kingdom Usage Restrictions Cite original article and credit line. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.