Spores of the fungus Phyllosticta ampelicida.
Pure culture of Guignardia bidwellii on malt agar medium, after 18 d incubation at 20°C, with pycnidia grouped in masses of black sclerotia.
Dark, spore-producing bodies ("pycnidia") on fruit
Dark, spore-producing bodies ("pycnidia") on fruit oozing tan tendrils of spores
Spore-producing body ("pycnidia") oozing spores