Lichen structure viewed with the scanning electron microscope; Investigations into the ultrastructure of lichens; The morphological and taxonomic significance of Cephalodia; Algal taxonomy and the taxonomy of lichens: the phycobiont of Verrucaria adriatica; Vezdaea, a peculiar lichen genus, and its phycobiont; Studies in the developmental morphology of lichenized ascomycetes; Lichen chemotaxonomy; Chemotaxonomic studies on the Cladonia chlorophaea-pyxidata complex and some allied species in britain; Ecological aspects of dispersal and establishment in lichens; Distribution patterns shown by epiphytic lichens in the British isles; Lichenological indicators of age and environmental continuity in woodlands; Studies on the growth rates of lichens; Performance of Lecanora muralis in an urban environment; Nutritional aspects of marine and maritime lichen ecology; The lichen as an ecosystem: observation and experiment; Sulphur dioxide uptake in lichens; Mineral uptake by lichens; Aspects of nitrogen metabolism in lichens; The physiology of lichen symbiosis; A comparison between the lichen symbiosis and other symbioses.