1. Department of Botany and Plant Pathology Oregon State University 4575 SW Research Way Corvallis Oregon 97333 USA
2. Department of Microbiology Oregon State University Nash Hall 226 Corvallis Oregon 97331 USA
3. School of Marine Sciences University of Maine 5706 Aubert Hall Orono Maine 04469‐5706 USA
4. Department of Biology Colorado State University Biology Building, Room 111, 1878 Campus Delivery Fort Collins Colorado 80523‐1878 USA