Abstract
Abstract Light and electron microscopic studies have established that the endophyte of root nodules of Discaria toumatou is an actinomycete resembling those of other Frankia-induced actinorhizal nodules. The prokaryotic micro-organism has septate hyphae of 0.4–0.7 µm diam., and forms spherical vesicles of approx. 4 µm diam. in the infected plant cells. These vesicles contain complete and incomplete septa, granulated regions, electrondense regions, and prominent nucleoids. No sporangia or spores were seen in the nodules. Both the hyphal and vesicular forms of the endophyte are surrounded by a polysaccharide capsule. The infected host cells contain a single, large, lobed nucleus, many large plastids and mitochondria, and a few microbodies.
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