4/4/2010 Email from Jim E.: “I spotted the bright yellow fungus on False Arabis (Boechera fendleri), a mustard, as I returned from my meadow walk. As Weber and Wittmann describe, “In early spring, the new vegetative shoots are affected by a rust fungus, Puccinia monoica, which produces an aecial stage of yellow-orange pustules that cover the upper leaves. Every spring someone brings this in to ask what kind of wildflower it might be.” Here’s a photo from online….”