Fig. 1. Angico do cerrado plant inoculated with rhizobia, and its nodules. A, Typical morphology of a 10‐month‐old inoculated plant grown under experimental conditions. The shoot shows no symptoms of nitrogen deficiency and most of the nodules (arrow) are located near the xylopodium (x). B, Higher magnification of the same xylopodium. Note some lateral roots bearing nodules (arrows) that differ in morphology, colour and size. C, Nodules at different stages of development. Young nodules are white and brown, and round in shape. These become cylindrical and multi‐lobed as they mature, and older nodules have white tips. Bar = 10 mm. D, Nodules showing their inner pigmentation pattern as described in the text (small arrow). Sometimes this pattern was less evident and poorly delimited (small arrowheads). A section through the tip of a multi‐lobed nodule (large arrow) is shown; the pink colouration is due to leghaemoglobin. A black, degenerate nodule (bottom of picture) is also shown. Bar = 5 mm.