. Fig. 215.—Cronartium asclepiadnnn. Section of a Cynanchum leaf. The leaf-parenchyma is permeated with mycelium, and sori are formed on the lower epidermis. A, uredo-sorus ; B, televitospore-sorus, many spores of which have germinated and given off promycelia with sporidia. (v. Tubeuf del.) Brown spots may be found on the leaves of the Cynanchinn'^ during July, August, and September (Fig. 214). On examina- tion of the spots with a lens, the leaf-epidermis will be found ^A very common plant in Europe though not indigenous to Britain. (Edit.)

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