Cycad Seeds (IMAGE) University of Guam Caption The arborescent cycad known as Cycas micronesica produces seeds that have been harvested as a starch source in the human diet. The seeds are a possible toxin source that influenced a high incidence of a rare neurological disease in Guam during World War II. Credit University of Guam Usage Restrictions None 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.