Normal Seed Cones vs Mummy Seed Cones (image) University of California - Berkeley Share Print E-Mail Caption Normal seed cones (left) of the dwarf pine Pinus mugo compared to the shriveled seed cones of trees irradiated with more than 10 times the amount of UV-B that hits Earth's surface today. Once removed from the UV-B growth chambers, the trees regained their fertility. The irradiated trees also produced malformed pollen, which has been observed in fossils from the end of the Permian Period 252 million years ago. Credit Jeffrey Benca, UC Berkeley Usage Restrictions None 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.