1. Taxonomic and biosystematic categories

   • D. H. Valentine
   • Áskell Löve

   OriginalPaper Pages: 153 - 166

2. Observations on the Florida flora

   • R. K. Godfrey
   • Robert Kral

   OriginalPaper Pages: 166 - 177

3. Chemical components of type specimens in Parmelia—I

   • Mason E. Hale

   OriginalPaper Pages: 177 - 180

4. New names and combinations in the genus Galium

   • Lauramay T. Dempster

   OriginalPaper Pages: 181 - 192

5. A new species of Helianthus from North Carolina and Tennessee

   • Dale M. Smith

   OriginalPaper Pages: 192 - 194

6. New species of Capsicum from South America

   • Charles B. Heiser
   • Paul G. Smith

   OriginalPaper Pages: 194 - 201

7. Studies on secotiaceous fungi—I: A monograph of the genus Thaxterogaster

   • Rolf Singer
   • Alexander H. Smith

   OriginalPaper Pages: 201 - 216

8. Studies on secotiaceous fungi—II: Endoptychum depressum

   • Rolf Singer
   • Alexander H. Smith

   OriginalPaper Pages: 216 - 221

9. List of members American Society of Plant Taxonomists

   Announcement Pages: 222 - 231

10. Editorial

    • H. W. Rickett

    EditorialNotes Pages: 232 - 232