. Fig. i\.—Frankia n/ni. Root-tuliereles un the Alder, (v. Tubevif jiliot.) chlorophyll and furnished 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 jMiJller proved their fungal origin. The species of fungi wdiich produce these tubercles liave been

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897