Abstract
Summary Striga aspera (Willd.) Benth. (Scrophulariaceae) a parasitic plant on Sorghum (Sorghum vulgare L.) or on maize (Zea mays L.) in Senegal, is attached to host roots by suckers named haustoria. The mature haustorium, from the mother root to the host root, is divided into three areas: the vascular head, the vascular parenchymatous core and the endophyte (intrusive cells). The ultra- structure of these areas was studied by transmission electron microscopy. In the vascular parenchymatous core, the hyaline body shows intense meristematic and metabolic activity. The presence of numerous plasmodesmata in the cell walls of the parenchymatous cells of the cortex suggested that this tissue could play a key role in the metabolites transfer in place of phloem which was not identified in the haustorium of S. aspera.
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