. Elementary botany. Botany. 324 ECOLOGY. only a short branch of the mycelium, nutritive substances are taken by the fungus from the protoplasm or cell-sap of the carnation. From here it passes to the threads of the mycelium. These in turn supply food material for the development of the dark brown gonidia, which we see form the dark- looking powder on the spots. Many other fungi form haustoria, which take up nutrient matters in the way described for the carnation rust. In the case. Fig. 427. Cell from carnation leaf, showing haustorium of rust mycelium grasping the nucleus of the host, h^ haus

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