1. Division polarity, development and configuration of microtubule arrays in bryophyte meiosis

   • R. C. Brown
   • B. E. Lemmon

   OriginalPaper Pages: 1 - 10

2. Ultrastructural cytology of plastids in pollen grains of certain androgenic and nonandrogenic plants

   • R. S. Sangwan
   • B. S. Sangwan-Norreel

   OriginalPaper Pages: 11 - 22

3. Electrical fusion of protoplasts from sycamore mutants and hybrid selection on hypoxanthine-aminopterin-thymidine (HAT) medium

   • Nadine Burlion
   • D. H. Northcote

   OriginalPaper Pages: 23 - 31

4. Serial reconstruction and behaviour during cytokinesis of the chondriome ofProrocentrum minimum (Pavillard) Schiller (Pyrrhophyta)

   • S. M. Malcolm
   • R. Wetherbee

   OriginalPaper Pages: 32 - 36

5. The effect of light on the number of chloroplast nucleoids in daughter cells of the algaScenedesmus quadricauda

   • V. Zachleder
   • V. Cepák

   OriginalPaper Pages: 37 - 44

6. Spatial organization and volume density of leucoplasts in pine secretory cells

   • J. Charon
   • J. Launay
   • J. -P. Carde

   OriginalPaper Pages: 45 - 53

7. Isolation of a Ca²⁺-protease resistant high Mr microtubule binding protein from mammalian brain: Characterization of properties partially expected for a dynein-like molecule

   • Ch. Koszka
   • R. Foisner
   • G. Wiche

   OriginalPaper Pages: 54 - 61

8. The freeze-fractured structure of spermatocyte dictyosome-like structures

   • H. H. Mollenhauer
   • H. C. Aldrich
   • D. J. Morre

   Brief Report Pages: 62 - 64

9. Ball and socket figures between secretory vesicles in mammary epithelial cells

   • D. P. Dylewski
   • T. W. Keenan

   Rapid Communication Pages: 65 - 68

10. Reorganization of actin filaments associated with the differentiation of tracheary elements inZinnia mesophyll cells

    • H. Kobayashi
    • H. Fukuda
    • H. Shibaoka

    Rapid Communication Pages: 69 - 71