Phoma lingam seed assay – cauliflower 19x

Black pycnidia of the black leg fungus, Phoma lingam, on an infected cauliflower seed. Note the amethyst-colored cirrhi (gelatinous matrix) oozing from the pycnidia, which indicates the strain of the pathogen is virulent (able to cause Phoma leaf spot or black leg of brassicas)

Photo Source: Lindsey du Toit, Washington State University.