Abstract
The aecial stage of a rust on Ephedra has been called a Peridermium. Clues as to its telial stage have been lacking. It is here described as resembling more a form of Roestelia, and the reasons for its possible relation to Gymnosporangium multiporum Kern are presented: the two sets of hosts have similar distributions: the two rust stages have the same geographic range; they have been found in close proximity in the field.
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