Aecidium magellanicum

Aecidium magellanicum, commonly known as the calafate rust, is a species of rust fungi. This fungus can cause a growth defect known as a witches broom, an excessive growth of stems from a single point on a branch. The species is known to infect the evergreen shrub Berberis buxifolia in Argentina and Chile.^[1]

Aecidium magellanicum
Calafate rust growing on the shrub Beriberis microphylla in Chile.
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Pucciniomycetes
Order:	Pucciniales
Family:	incertae sedis
Genus:	Aecidium
Species:	A. magellanicum
Binomial name
Aecidium magellanicum Berk. (1847)