On Quercus
This is a picture of Uromyces ari-triphylli on a Jack in the Pulpit at the Smithsonian Environmental Research Center in Edgewater, Maryland.
This is a picture of Andricus quercuspetiolicola at the Smithsonian Environmental Research Center in Edgewater, Maryland.
This is a picture of a Amphibolips acuminata at the Smithsonian Environmental Research Center in Edgewater, Maryland.