. i'hloropliyll and fuinished with normal roots is as yet unknown. Plants which have grown well for years in water-cultures do not show them. On account of the cork-covering with which these tubercles are furnished, it would seem that they are not adapted for taking nourishment out of the soil. Woronin described them first on the alder, Warming on Klaeagnaceae, while Miiller proved their fungal origin. T\u' species of fungi whicli produce these tubercles liave been

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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi