Lichen Physiology and Cell Biology

1. Front Matter

   Pages i-xi

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2. Some Aspects of Carbohydrate Metabolism in Lichens

   • J. D. MacFarlane, K. A. Kershaw

   Pages 1-8

3. Photosynthetic Parameters in Ramalina Duriaei, in Vivo, Studied by Photoacoustics

   • R. Ronen, O. Canaani, J. Garty, D. Cahen, S. Malkin, M. Galun

   Pages 9-22

4. Method for Field Measurements of CO2-Exchange. The Diurnal Changes in Net Photosynthesis and Photosynthetic Capacity of Lichens under Mediterranean Climatic Conditions

   • O. L. Lange, J. D. Tenhunen, P. Harley, H. Walz

   Pages 23-39

5. Water Relations and Net Photosynthesis of Usnea. A Comparison between Usnea Fasciata (Maritime Antarctic) and Usnea Sulphurea (Continental Antarctic)

   • L. Kappen

   Pages 41-56

6. Photosynthesis, Water Relations and Thallus Structure of Stictaceae Lichens

   • T. G. A. Green, W. P. Snelgar, A. L. Wilkins

   Pages 57-75

7. CO2 Exchange in Lichens: Towards a Mechanistic Model

   • S. O. Link, M. F. Driscoll, T. H. Nash III

   Pages 77-91

8. Photosynthetic Capacity Changes in Lichens and their Potential Ecological Significance

   • K. A. Kershaw

   Pages 93-109

9. Electrophoretic and Gas Exchange Patterns of Two Populations of Peltigera Rufescens

   • D. Brown, K. A. Kershaw

   Pages 111-128

10. Multiple Enzyme Forms in Lichens

    • D. Fahselt

    Pages 129-143

11. Studies on the Nitrogen Metabolism of the Lichens Peltigera Aphthosa and Peltigera Canina

    • P. Rowell, A. N. Rai, W. D. P. Stewart

    Pages 145-160

12. Nitrogen Losses from Diazotrophic Lichens

    • J. W. Millbank

    Pages 161-172

13. Influence of Automobile Exhaust and Lead on the Oxygen Exchange of Two Lichens Measured by a New Oxygen Electrode Method

    • V. Lemaistre

    Pages 173-183

14. Mineral Element Accumulation in Bog Lichens

    • P. Pakarinen

    Pages 185-192

15. The Distribution of Uranium and Companion Elements in Lichen Heath Associated with Undisturbed Uranium Deposits in the Canadian Arctic

    • J. H. H. Looney, K. A. Kershaw, E. Nieboer, C. Webber, P. I. Stetsko

    Pages 193-209

16. Temporal Variation in Lichen Element Levels

    • K. J. Puckett

    Pages 211-225

17. Lead and Uranium Uptake by Lichens

    • D. H. S. Richardson, S. Kiang, V. Ahmadjian, E. Nieboer

    Pages 227-246

18. The Role of the Cell Wall in the Intracellular Uptake of Cations by Lichens

    • D. H. Brown, R. P. Beckett

    Pages 247-258

19. Ultrastructural Studies of Desiccated Lichens

    • C. Ascaso, D. H. Brown, S. Rapsch

    Pages 259-274

20. The Architecture of the Concentric Bodies in the Mycobiont of Peltigera Praetextata

    • E. Peveling, H. Robenek, B. Berns

    Pages 275-285

It is currently impossible to grow lichens under controlled conditions in the laboratory in sufficient quantity for physiological experiments. Lichen growth is slow and conditions which might accelerate the process tend to favour either the algal or fungal partner, resulting in the breakdown of balance symbiosis. Lichen physiologists are therefore forced to use field-grown material with all the problems associated with the unknown influences of unpredictable and unreproducible climatic conditions. Study of major biochemical topics, such as the nature of the carbohydrate and nitrogenous compounds passing between the symbionts, is less influenced by climatic conditions than the intrinsic nature of the symbionts and many advances have been made in these areas. Recently, the challenge of using field-grown plant material, the physiological status of which is intimately linked to environmental conditions, has proved to be a stimulus rather than a hindrance to a number of research groups. The occurrence of lichens in extreme habitats has prompted a number of field and laboratory studies with material from such diverse localities as the cold deserts of Antarctica and the temperate rain forests of the New Zealand bush. A comparative approach, using contrasted species or habitats from a particular geographical region has yielded much information and an appreciation of the variety of physiological adaptations which may exist. The close linkage between morphology and physiology is now being directly demonstrated, as is the relevance of ultrastructural information.

• biology
• cell
• cell biology
• influence
• morphology
• physiology
• Tree Biology

• University of Bristol, Bristol, England

  D. H. Brown

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