Conidial morphology changes in four Phyllosticta species

Production of pycnidia and conidia by Phyllosticta theacearum, Phyllosticta sp. (ex Euonymus) and Phyllosticta sp. (ex Portulaca) (grown on PDA), and P. cruenta (from specimens) was studied. On PDA, conidial appendages of Phyllosticta sp. (ex Portulaca) disappeared completely after 16 days, of P. theacearum after 29 days, and of Phyllosticta sp. (ex Euonymus) after 14 days. In slide preparations mounted in water, appendages of all four species persisted; the appendages of P. cruenta and Phyllosticta sp. (ex Euonymus) became 2-4 times longer within 30 minutes, while those of Phyllosticta sp. (ex Portulaca) and P. theacearum remained unchanged.