Biplots of a principal component analysis (PCA) of six teliospore characteristics of specimens of A Ravenelia macowaniana originating from Vachellia karroo (red) and V. natalitia (green) and B in comparison with R. xanthophloeae sp. nov. collected from V. xanthophloea (blue) C, D represent R. evansii originating from seven distinct Vachellia species. Each dot represents an individual teliospore for which mean values of multiple measurements of all six defined morphological characteristics were calculated. Each colour represents the host species of the individual rust specimen. In D only spore representatives collected from V. borleae, V. exuvialis and V. davyi were highlighted to gain better visibility.