Fig. 1
From: Mapping non-host resistance to the stem rust pathogen in an interspecific barberry hybrid
Schematic of the hypothesized evolution of modern day macrocyclic, heteroecious Puccinia species. Host jump is believed to be a frequent event in the evolution of rusts, and barberries are thought to be one of the first eudicots parasitized by the rusts. Dotted arrows indicate a lack of existing rust species connecting the respective host groups. In such cases, connection is indirectly supported by relative morphological similarity among teliospores. Solid arrows connect two host species between which the indicated rust species alternate