1. TheAzolla-Anabaena association: Historical perspective, symbiosis and energy metabolism

   • Ding-Ji Shi
   • David O. Hall

   Interpreting Botanical Progress Pages: 353 - 386

2. The relation of root systems to shoot systems in vascular plants

   • Paul A. Groff
   • Donald R. Kaplan

   Interpreting Botanical Progress Pages: 387 - 422

3. TheLeveillula mildews

   • Josef Palti

   Interpreting Botanical Progress Pages: 423 - 535