1. DSM Nutritional Products, 60 Westview St, Lexington, MA 02421, USA.
2. Department of Biology, Brookhaven National Laboratory, 50 Bell Ave, Upton, NY 11973, USA.
3. DSM Biotechnology Center, Alexander Fleminglaan 1, 2613 AX Delft, Netherlands.
4. Department of Organismic and Evolutionary Biology, Farlow Herbarium of Cryptogamic Botany, Harvard University, 22 Divinity Avenue, Cambridge, MA 02138, USA.