Dr M. C. RAYNER concludes her series of papers on mycorrlaza at the May issue of the New Phytologist. The final chapter is devoted to a consideration of the significance of these structures, and the nutrition of mycorrhiza plants. The author holds a brief for the view that the relationship between fungus and host plant is a reciprocal one beneficial to both symbionts, and implies an exchange of food material with a credit balance on the side of the vascular plant.

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    Mycorrhiza. Nature 120, 243–244 (1927).

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