Fig. 2. Aecium of cedar apple rust on the underside of a leaf in August. By Kostina | Published 6 Dec 2013 | Full size is 1382 × 1339 pixels Fig. 3. Aecium of hawthorn rust showing characteristic long aecial tubes Fig. 2. Aecium of cedar apple rust on the underside of a leaf in August. Bookmark the permalink.