Arthuriomyces peckianus (Howe) Cummins & Hiratsuka, 1983
orange berry rust
Rubus © Bruce Watt, University of Maine, Bugwood.org
aecia in detail
Rubus saxatilis, from González-Fragoso (1925a): teliosporen
No host plant alternation; Spermogonia usually epiphyllous, ± 0.1 mm, yellow, later brown. Aeci hypophyllous, large and flat, often covering the entire leaf underside with an orange film; infected leaves remain small and have a definitely diseased aspect. No uredinia. Telia, small, black, hypophyllous on yellow spots. Teliospores two-celled, ech cell with a small, well differentiated papilla; wall thin, smooth; pedicel hyaline, deciduous. The fungus is systemic, hibernates with the plant.
Rosaceae, narrowly monophagous
Rubus arcticus, canadensis, chloocladus, leptadenes, sanctus, saxatilis.
Gymnoconia peckiana (Howe) Trotter, 1910; G. interstitialis (Schlechtendal) Lagerheim, 1894.
Very closely related to the species above is Gymnoconia nitens (Schweinitz) Kern & Thurston, 1929. It differs only in a somewhat different host plant spectre (likewise without R. fruticosus or idaeus, and by the absence of a telia stage.
Bahcecioglu & Kabaktepe (2012a), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Gäumann (1959a), Helfer (2005a), Henderson (2000a), Klenke & Scholler (2015a), Poelt & Zwetko (1997a), Roskam (2019a).