Pucciniastrum areolatum (Fries) Otth, 1863
Picea abies, Belgium, prov. Namur, Viroinval, Vierves-sur-Viroin, 27.ix.2019 © Stéphane Claerebout: young aecia
Picea abies, from González-Fragoso (1925a): two cone scales, occupied by aecia; at right they still are closed
the spermogonia form white, up to 4 mm large crusts at the underside of the cone scales; they exude a sugary liquid with a strong, sweet smell. Aecia densely crowded on the cone scales, mostly near the base, pale reddish brown, 1 mm high, lignifying. Aeciospores densely covered with high, almost cylindrical warts, except one area that is smooth and thin-walled.
Prunus padus, Belgium, prov. Limbourg, Zonhoven, Wijvenheide, 17.ix.2018 © Carina Van Steenwinkel: leaf upper side with telia
same leaf, underside, with uredinia
microscopical image of a telium, horizontal section (that is, parallel to the leaf surface)
an individual plant cell with teliopsores
Prunus padus, Belgium, prov. Limbourg, Neerpelt, ‘t Hageven, 19.vi.2018 © Carina Van Steenwinkel
same leaf, underside
more severe infection
same leaf, underside
part of the leaf underside, with uredinia
Prunus, Houthem-St. Gerlach, underside of the leaf with uredinia
upper side of a leaf, with telia limited by the leaf venation
uredinia at the underside of the leaf, on pinkish leaf spots, covered by the epidermis, except for a small pore that releases the spores. Telia epiphyllous, small pulvinate purple-shining spots, limited by the micro-venation. Teliospores in groups of 2-4, intercellular in the leaf mesenchym.
Prunus avium, cerasus, domestica & subsp. insititia, mahaleb, padus & subsp. borealis, serotina, spinosa, virginiana.
Blumer (1946a), Brandenburger (1985a: 20), Doppelbaur & Doppelbaur (1973a), Ellis & Ellis (1997a), Gäumann (1959a), González-Fragoso (1925a), Helfer (2005a), Henderson (2000a, 2004a), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Llorens i Villagrasa (1984a), Maier, Begerow, Weiß & Oberwinkler (2003a), Negrean (1997a), Scheuer & Bechter (2012a), Schmid-Heckel (1985a), Termorshuizen & Swertz (2011a), Vanderweyen & Fraiture (2007a), Wilson & Henderson (1966a).