Laver is a red seaweed, gathered from along the British and Irish coasts. One type, Sea Lettuce, is used in salads, soups and sauces. Sea lettuce is a fine, silky plant that is mashed and boiled, then sold as "laverbread". The Japanese laver, Porohyra tenera, is gathered and dried to a thin, flexible, dark-brown sheet called hoshi nori and askusa nori. These are used in sauces, soups, sandwiches and vinegared rice dishes.
Dowell, P., Bailey, A. (1980) The Book of Ingredients, Dorling Kindersley. ISBN 0718119150.]