Puccinia difformis Kunze, 1917
on Galium
Galium spec., Belgium, prov. Antwerp, Balen, Scheps © Carina Van Steenwinkel: telia on the underside of the leaves and on the stem
upper side of the leaves with brown lesions
teliospores
detail; average length of the spores and the pedicels 49 and 42 µm, respectively.
gall
No host plant alternation. Spermogonia, aecia and telia hypophyllous – no uredinia are formed. Spermogonia yellow, between the aecia. Aecia with white peridium and yellow spores; they are dispersed, not arranged in clear groups. Telia also on the stems, causing there galling. They are long covered by a lead grey epidermis, eventually naked and black; spores 2-celled, 27-21 x 32-46 µm, on a long persistent pedicel, not quickly germinating.
host plants
Rubiaceae, narrowly monophagous
Galium album, aparine, mollugo, spurium.
Galium aparine is the most important one.
synonyms
Puccinia ambigua (Albertini & Schweinitz) Lagerheim, 1897; ? Uromyces ambigua (de Candolle) Fuckel.
references
Beltran Tejera (1976a), Brandenburger (1985a: 408, 720), Buhr (1964b), Doppelbaur & Doppelbaur (1968a), Ellis & Ellis (1997a), Gäumann (1959a), Gjaerum (1987a), Gjaerum & Dennis (1976a), Gjaerum & Sunding (1986a), González Fragoso (1924a), Henderson (2000a), Klenke & Scholler (2015a), Poelt & Zwetko (1997a), Preece & Hick (1994a), Redfern & Shirley (2011a), Savchenko, Heluta, Wasser & Nevo (2014d), Savchenko, Wasser, Heluta & Nevo (2019a), Termorshuizen & Swertz (2011a), Tomasi (2014a), Wilson & Henderson (1966a), Woods, Stringer, Evans & Chater (2015a).