Part 1 Review: botanical aspects of landscape ecology with outlooks on forest dieback. Part 2 Physiology: plant water relations; the leaf epidermis; developmental physiology; intracellular movement; thermotropic responses of biomembranes exemplified by the tonoplants of crassaculacean acid metabolism plants; nitrate or ammonium uptake and transport, and rapid regulation of nitrate reduction in higher plants; secondary plant substances; carbohydrate processing in the mesophyll trajectory in symplasmic and apoplasmic phloem loading. Part 3 Genetics: replication; recombination; extranuclear inheritance; molecular cell biology; genetics of phytopathogenic fungi. Part 4 Taxonomy: flower evolution; systematics and evolution of the algae; lichenized and lichenicolous fungi. Part 5 Geobotany: population ecology; special topics; phloem in plant tissue cultures; floral ecology.