1. Formative and proliferative cell divisions, cell differentiation, and developmental changes in the meristem of Azolla roots

   • B. E. S. Gunning
   • J. E. Hughes
   • A. R. Hardham

   OriginalPaper Pages: 121 - 144

2. Pre-prophase bands of microtubules in all categories of formative and proliferative cell division in Azolla roots

   • B. E. S. Gunning
   • A. R. Hardham
   • J. E. Hughes

   OriginalPaper Pages: 145 - 160

3. Evidence for initiation of microtubules in discrete regions of the cell cortex in Azolla root-tip cells, and an hypothesis on the development of cortical arrays of microtubules

   • B. E. S. Gunning
   • A. R. Hardham
   • J. E. Hughes

   OriginalPaper Pages: 161 - 179

4. Age-related and origin-related control of the numbers of plasmodesmata in cell walls of developing Azolla roots

   • B. E. S. Gunning

   OriginalPaper Pages: 181 - 190

5. The microscopy of P-protein filaments in freeze-etched sieve pores

   • Richard P. C. Johnson

   OriginalPaper Pages: 191 - 205

6. Studies of chloroplast development in four maize mutants defective in chlorophyll biosynthesis

   • Peter N. Mascia
   • Donald S. Robertson

   OriginalPaper Pages: 207 - 211

7. Fluxes and compartmentation of K⁺, Na⁺ and Cl⁻, and action of auxins in suspension-cultured Petroselinum cells

   • Helmut Pfrüner
   • Friedrich-W. Bentrup

   OriginalPaper Pages: 213 - 223

8. Sulfite: Preferential sulfur source and modifier of CO₂ fixation in Chlorella vulgaris

   • Gian Franco Soldatini
   • Irmgard Ziegler
   • Hubert Ziegler

   OriginalPaper Pages: 225 - 231