Two smut fungi on two different species of Ischaemum are taxonomically assessed based on newly studied collections. Sporisorium austroafricanum M. Pitek is described and illustrated as a new species infecting Ischaemum fasciculatum in South Africa. Among the smut fungi described on Ischaemum, it is similar only to Sporisorium ischaemi-anthephoroides, from which it differs by the macroscopic appearance of sori and by larger sterile cells with thicker walls. Tolyposporium bogoriense originally described as occurring on Panicum sp. in Indonesia (Java) appeared to be on Ischaemum cf. timorense and identical with Sporisorium flagellatum, the latter having priority. The morphology of this species is described and illustrated based on the holotype of T. bogoriense.
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Vol. 46 • No. 5