Cystotheca | |
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Cystotheca lanestris witch's broom on Quercus in Calfornia. | |
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Genus: | Cystotheca Berk. & Curtis, 1860 |
Cystotheca is a genus of plant pathogenic fungi in the family Erysiphaceae (powdery mildews). [1]
Many Cystotheca species form dense, white or brown, distorting patches on the leaves of their hosts. Some species in this genus are also known to cause witch's-broom galls on their hosts. [2]