With one new volume each year, this series keeps scientists and advanced students informed of the latest developments and results in all areas of botany. The present volume includes reviews on structural botany, plant physiology, genetics, taxonomy, and geobotany.

A. Structural Botany.- I. Cell Architecture and Cellular Morphogenesis of Eukariotic Algae (Chlorophyta).- II. Comparative Morphology, Anatomy, and Function of the Stem and Root of the Flowering Plants.- B. Physiology.- I. Electrophysiology of Stomata.- II. Exchange of Energy and Vapor Between Plants and the Atmosphere.- III. Secondary Plant Substances: Ornithine-Derived Alkaloids.- IV. Mineral Nutrition: Humid Tropical Forests.- V. Geosiphon pyriforme (Kützing) von Wettstein, a Promising System for Studying Endocyanoses.- VI. Significance of Glutathione Metabolism in Plants Under Stress.- VII. A Stress Physiological Role for Abscisic Acid (ABA) in Lower Plants.- VIII. UV-B Effects on Terrestrial Plants and Aquatic Organisms.- IX. Molecular Aspects of Natural and Induced Incompatibility in Flowering Plants.- C. Genetics.- I. Replication and Cell Cycle Control.- II. Recombination: Effects on Structure and Function of the Mitochondrial Genome.- III. Mutation: Higher Plants.- IV. Function of Genetic Material, Regulation of Genes Encoding Seed Storage Proteins.- V. Extranuclear Inheritance: Plastid Genetics.- VI. Population Genetics.- D. Taxonomy.- I. Lichenized and Lichenicolous Fungi 1991-1992.- II. Molecular Systematics: 1991-1993.- III. Karyology and Cytogenetics.- E. Geobotany.- I. Plant Population Ecology.