N.W. Simmonds (see Recommended Reading) did an interesting experiment in Scotland. He wanted to prove that Solanum tuberosum was derived from the South American species Solanum andigena. He also wanted to show that horizontal resistance to blight could be accumulated in the very susceptible S. andigena. He proved both these points by recurrent mass selection, and he produced a new kind of potato which he called neo-tuberosum. This new potato is closely similar to cultivated potatoes, and it has a useful level of horizontal resistance to blight. It has been used in commercial potato breeding, and these new clones would be useful parents for amateur breeders, particularly if they were trying to widen the genetic base.

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