Rossmanomyces pyrolae . a, b. On Picea abies: a. Primary aecia on abaxial side of a cone scale; b. Annulate wall ornaments of a primary aeciospore in SEM; in contrast to the annulate ornaments of related Melampsorineae, these consist of only two disc-like elements on a stout foot; c–h. On Pyrola minor: c. Secondary aecia (uredinia); d. Chains of secondary aeciospores (urediniospores); e. Secondary aeciospore; f. Wall of secondary aeciospore with dome-shaped ornaments in SEM; g. Telium in median section; h. Germinating teliospores with basidia and basidiospores; (a by Waldschutz Schweiz WSL, with permission; b, f from Zwetko and Blanz 2018: 281; c by Julia Kruse; d, e, g, h from Klebahn 1914: 722).