Wasting Disease of Eelgrass (Zostera marina)

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IN a report by Dr. Harrison F. Lewis of the Department of the Interior, Canada (referred to in NATURE of August 19, p. 277), it is mentioned that Dr. E. Silver Dowding has found in one blackened portion of the cortex of the rhizome “a coarse mycelium”, “but as it could not be found in any other samples examined, it was not considered to be a cause of the disease”. On account of this, I wish to communicate here that during last summer I have studied this disease, which now is widespread in Danish waters, and that I have always in the blackened spots seen the mycelium of a fungus as a constant feature.

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