1. Is there a plant interferon?

   • Meyer Chessin

   OriginalPaper Pages: 1 - 28

2. Regulation of gametangial formation in bryophytes

   • R. N. Chopra
   • S. C. Bhatla

   OriginalPaper Pages: 29 - 63

3. Distribution and biohistory of the endemic flora of the mid-Appalachian shale barrens

   • Carl S. Keener

   OriginalPaper Pages: 65 - 115

4. Structural and functional attributes of the vegetation of northern mixed prairie of North America

   • J. S. Singh
   • W. K. Lauenroth
   • J. L. Dodd

   OriginalPaper Pages: 117 - 149