. Fig. 6i. Potato Diseases. a. Black wart (after Giissow), b. late blight on foliage, c. late blight on tuber, d. successive stages of the development of the conidia of Phyiophlhora infeslans (b. and d. after L. R. Jones), e. germination of conidia of Phytophthora infestuns, by means of zoopores (after Ward),/, mature oogonium of P. infcstans (after Clinton), g. melters, surface view, early stage of infection, h. pycnidium of Phoina titberosa (after Melhus and Rosenbaum).

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