THIS very common flowering plant used to cover large areas of estuaries of Britain, but about fifteen years ago it died out almost completely on both sides of the Atlantic, though not on the Pacific coasts of the United States. Evidence as to the present condition is now being sought, both here and in America. It would be much appreciated if those who knew the Zostera beds formerly would please send information as to continued absence or extent of regeneration, also as to whether anything else now occupies the areas thus left bare. The late Dr. E. J. Butler informed me in September 1938 that annually since 1932 he had watched a small 'meadow' in Guernsey. Though about 75–90 per cent went the first year, the rest was then holding its own. The fungus Ophiobolus halimus, Diehl and Mounce, was always present on it, but there was no sign of extermination. In fact, he thought there was some increase. There is very little of it around here now.