New species of phakopsora (Basidiomycota, Uredinales) from Cameroon, South Africa and Brazil

Phakopsora dissotidis, Ph. melhaniae, and Ph. merremiae are described as new rust species on Dissotis thollonii var. elliotii (Melastomataceae), Melhania didyma (Sterculiaceae) and Merremia aegyptia (Convolvulaceae) from Cameroon, South Africa and Brazil, respectively. Ph. merremiae is the teleomorph stage of Uredo merremiae and the first species of Phakopsora reported on a member of Convolvulaceae. Melastomataceae is a new host family for Phakopsora as well.