Abstract
The development of the primary haustorium of the hemiparasite, Alectra vogelii , on the roots of one of its hosts, Voandzeia subterranea (Fabaceae), has been studied morphologically and anatomically. A simple method for cultivation was used in order to observe the different stages of parasite development. Upon contact between parasite seedling and host, localized swelling of host root tissue ensues. The front cells of the advancing primary haustorium are densely structured and directed towards the stele of the host root. Several lateral roots originate in the swollen area of contact. That part of the formerly rather thin root of the parasite that remains outside the host root thickens. The apical meristem of the stem then grows out of the seed coat. The nature of the connecting tissue within the haustorium is presently being investigated.
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