A. Morphology.- I. Special Cytology. Cytology and Morphogenesis of the Fungal Cell.- B. Physiology.- I. Plant Water Relations.- II. Mineral Metabolism. Absorption and Translocation of Mineral Ions in Higher Plants.- III. Photosynthesis. Structure and Function of the Photosynthetic Membrane.- IVa. Metabolism of Inorganic Nitrogen Compounds.- IVb. Metabolism of Organic N-Compounds. Ammonium Assimilation and Amino Acid Metabolism.- V. Secondary Plant Substances. Special Topics of the Phenyl-propanoid Metabolism.- VI. Growth.- VII. Developmental Physiology.- VIII. Bewegungen.- C. Genetics.- I. Replication. Replication of the Eukaryotic Chromosome.- II. Recombination. Asexual Recombination in Higher Plants.- III. Mutation: Higher Plants.- IV. Function of Genetic Material. Organization and Function of the Eukariotic Genome.- V. Extranucleäre Vererbung. Die Morphologie extranucleärer Erbträger im Verlauf des Lebenszyklus.- VI. Population Genetics.- D. Taxonomy.- I. Systematics and Evolution of Seed Plants.- II. Paläobotanik. Bericht über die Jahre 1975–1978.- E. Geobotany.- I. Areal- und Florenkunde (Floristische Geobotanik).- II. The History of Flora and Vegetation During the Quaternary.- III. Vegetation Science (Sociological Geobotany).