Contributions towards a monograph of Phoma (Coelomycetes) — IX. Section Macrospora

Nine species of Phoma, characterised by always producing relatively large conidia, usually between 7-25 x 2.5-8 µm, aseptate or partly septate, are documented and described in vitro. Three of these fungi could not be described in the usual way, because living cultures were no longer available. The following new taxa are proposed: Phoma andropogonivora (R. Sprague & Rogerson) comb, nov., Phoma boeremae nom. nov., Phoma commelinicola (E. Young) comb. nov. and Phoma gossypiicola nom. nov. The combination Phoma rabiei proposed by Khune is validated along with its teleomorph Mycosphaerella rabiei Kovatsch. Keys and indices on host-fungus and fungus-host relationships are provided and short comments on the ecology and distribution are given.