This volume contains a collection of papers on the anatomy, physiology and action of stomata by experts in the field, presented in a form suitable for students of botany and plant science, and related subjects such as agriculture, forestry, and horticulture, at the undergraduate and postgraduate level. Special care has been taken to ensure that the book can be used as a text for undergraduate courses in plant, environmental and cell physiology at a reasonably advanced level. It provides an up-to-date assessment of our knowledge of stomata and the articles include: the structure and development of stomata; the measurement of stomatal aperture and conductance; the ion exchanges and metabolism of guard cells; work on isolated guard-cell protoplasts; the responses of stomata to a wide range of stimuli, including light, carbon dioxide, humidity, water stress, pollutants and disease organisms; the behaviour of stomata in the field; and a discussion of stomatal control of transpiration and photosynthesis.