Root nodules

In 1877, in his PhD thesis on plant galls, a young Dutch botanist called Martinus Willem Beijerinck expressed his frustration that he had not been able to find the insects responsible for "galls" on the roots of some plants.

In these paintings by his sister, Henri√ętte, the strong physical resemblance between these structures (below) and galls (above) is clear.

 

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