The use of mode of conidium development as a characteristic in the tax
onomy of the anamorphs of Ceratocystis sensu late led to a drastic inc
rease in the number of anamorph genera. This excessive number of anamo
rph names inspired reconsideration of these genera on the basis of mod
e of conidium development. This review shows that anamorphs of Ophiost
oma can be divided into two groups based on the mode of wall building
during conidiogenesis. These include both those having apical and ring
wall-building development. Patterns of development included in the ap
ical wall-building group are phialidic, annellidic and sympodial devel
opment. Following this restricted approach, the total number of anamor
ph names for Ceratocystis s.l. can be considerably reduced. For exampl
e, anamorphs of Ophiostoma could be Leptographium, Graphium, Hyalorhin
ocladiella, Sporothrix and Knoxdaviesia.