Ochropsora ariae (Fuckel) Ramsbottom, 1923
Anemone nemorosa, Belgium, prov. Limbourg, Guigoven, Belle-Vue-bos, 9.iv.2019 © Carina Van Steenwinkel: infected plant, surrounded by healthy plants
Anemone nemorosa, Amstelveen, de Braak, 3.v.2014: the fungus is systemic; an infected leaf often is unusually pale; always the petiole is strongly elongated, causing the leaf to rise well above the surrounding plants.
upperside; the leaf segments are strongly narrowed.
the complete underside is strewn with aecia.
the aecia are sunken in low pustules.
the peridium is untidy and soon drops off.
the aeciospores in the floor of the aecium are white.
spermogonia epiphyllous. Aecia mainly hypophyllous, dispersed over the entire leaf; peridium white. Infection is systemic.
Anemone blanda, nemorosa, ranunculoides, trifolia.
on Sorbus and other woody Rosaceae
uredinia hypophyllous, small, grey or yellowish spots, surrounded by a row of basally fused paraphyses that take the role of a peridium. Telia hypophyllous as well, flat flesh-coloured crusts of 0.5 mm, initially covered by the epidermis. The teliospores are sausage-shaped, standing erect, when mature consisting of four cells with a thin, hyaline and smooth wall. (In fact, that have germinated than already into a basidium).
Amelanchier asiatica, ovalis; Aruncus dioicus; Malus domestica, sylvestris; Prunus avium, cerasus, padus, tenella; Pyrus communis; Sorbus aria, aucuparia, hybrida, intermedia, latifolia, torminalis.
Ochropsora sorbi (Oudemans) Dietel, 1805.
Ben van As repeated finds isolated, strongly enlarged and late flowers of Anemone nemorosa, like in the picture below. Although no aecia have been seen it cannot be excluded that this is a symptom of infection by O. ariae. (In the immediate neighbourhood several rowan trees were growing).
Anemone nemorosa, Assen, Asserbos, 3.v.2013 © Ben van As
comparsion with a normal flower
Bahcecioglu & Gjaerum (2004a), Bahçecioğlu & Kabaktepe (2012a), Buhr (1964b), Coulianos & Holmåsen (1991a), Dauhpin & Aniotsbehere (1997a), Dietrich (2016b), Gäumann (1959a), González-Fragoso (1925a), Garcia-Guzmán & Wennström (2001a), Groom (2011a), Helfer (2005a), Henderson (2000a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Leysen (2013a), Ludwig (1974a), Maier, Begerow, Weiß & Oberwinkler (2003a), Poelt & Zwetko (1997a), Preece & Hick (1994a), Redfern & Shirley (2011a), Riegler-Hager (2014a), Roskam (2009a), Ruszkiewicz-Michalska (2006a), Savchenko, Heluta, Wasser & Nevo (2014c), Savchenko, Wasser, Heluta & Nevo (2019a), Schmid-Heckel (1985a), Termorshuizen & Swertz (2011a), Tomasi (2014a), Vanderweyen & Fraiture (2007a), Wilson & Henderson (1966a), Woods, Stringer, Evans & Chater (2015a).