SEM of S. Cardinale (IMAGE) University of California - Berkeley Caption Shown is a scanning electron micrograph of Seiridium cardinale, a fungal pathogen responsible for a global pandemic of cypress canker disease. Researchers have traced the likely origin of the disease back to California. Credit Photo by Alberto Panconesi, Italian National Research Council Usage Restrictions Must include image credit. License Licensed content 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.