Sympathize with Nunez's suggestion even if Dr.Khatami sounds quite correct.Research sustainability should induce to use the simplest (and cheapest) protocol wherever the target of diagnosis is not of vital importance: anyway a not too old review of Phomaceae
could be found on the "Atlas of Clinical Fungi "by Hoog, G. S. de; Guarro, J.; Gené, J.; Figueras, M. J., ISBN 90-70351-43-9. Boerema, too, wrote a "Phoma identification manual: Differentiation of (223) specific and infra-specific taxa in culture"edited by CABI.2004, ISBN 0851997430.