1. Studies onArtemisia afra Jacq.: The phloem in stem and leaf

   • C. E. J. Botha
   • Ray F. Evert

   OriginalPaper Pages: 217 - 231

2. Fucose in the surface deposits of axenic and field grown roots ofZea mays L.

   • Janet Vermeer
   • M. E. McCully

   OriginalPaper Pages: 233 - 248

3. Environmental control and evidence for predetermination of pollen embryogenesis inNicotiana tabacum pollen

   • E. Heberle-Bors
   • J. Reinert

   OriginalPaper Pages: 249 - 255

4. The flagellar root system in the gamete ofAcetabularia mediterranea

   • W. Herth
   • B. Heck
   • H. U. Koop

   OriginalPaper Pages: 257 - 269

5. Calcium oxalate crystals inOpuntia ficusindica (L.) mill.: Development and relation to mucilage cells — A stereological analysis

   • S. Trachtenberg
   • A. M. Mayer

   OriginalPaper Pages: 271 - 283

6. In vitro differentiation of embryogenic pollen, control by cold treatment and embryo formation inab initio pollen cultures ofNicotiana tabacum var. badischer burley

   • A. Rashid
   • J. Reinert

   OriginalPaper Pages: 285 - 294

7. Effects of microtubule-inhibitors on nuclear migration and rhizoid differentiation in germinating fern spores (Onoclea sensibilis)

   • Th. C. Vogelmann
   • A. R. Bassel
   • J. H. Miller

   OriginalPaper Pages: 295 - 316

8. Studies of vegetative compatibility-incompatibility in higher plants

   • R. Moore
   • D. B. Walker

   OriginalPaper Pages: 317 - 334

9. The immunocytochemical localization of 9.5 cellulase in abscission zones of bean (Phaseolus vulgaris cv. red kidney)

   • R. Sexton
   • M. L. Durbin
   • W. W. Thomson

   OriginalPaper Pages: 335 - 347

10. Occurrence and distribution of filipin-sterol complexes in chloroplast envelope membranes of algae and higher plants as visualized by freeze-fracture

    • M. Melkonian
    • H. Robenek
    • M. Steup

    OriginalPaper Pages: 349 - 358

11. Effects of copper on phagocytosis inTetrahymena

    • Jytte R. Nilsson

    OriginalPaper Pages: 359 - 370

12. Occurrence of the suberized lamella in leaves of grasses of different photosynthetic types. I. In parenchymatous bundle sheaths and PCR (“Kranz”) sheaths

    • P. W. Hattersley
    • A. J. Browning

    OriginalPaper Pages: 371 - 401

13. Location of heitz's zerstäubungsstadium (dispersion phase) in the mitotic cycle ofPhaseolus coccineus and the concept of Angiosperm endomitosis

    • A. Cavallini
    • P. G. Cionini
    • F. D'Amato

    OriginalPaper Pages: 403 - 414

14. Growth characteristics of hormone and vitamin independent photoautotrophic cell suspension cultures fromChenopodium rubrum

    • W. Hüsemann

    OriginalPaper Pages: 415 - 431

15. Chromosomal variation on plants regenerated from twoNicotiana spp.

    • V. Nuti Ronchi
    • M. Nozzolini
    • L. Avanzi

    OriginalPaper Pages: 433 - 444

16. Erratum

    • Z. Hejnowicz
    • A. Sievers

    Erratum Pages: 444 - 444