Gymnosporangium cornutum Arthur, 1911

aecia on Sorbus

Sorbus aucuparia, Ermelose Heide © Arnold Grosscurt: aecium

Gymnosporangium cornutum: aecium on Sorbus aucuparia

Sorbus aucuparia, België, prov. Limburg, Genk, de Maten © Carina Van Steenwinkel: aecium

young aecium

Gymnosporangium cornutum: peridium cells

peridium wall

detail

aeciospore

gall

The slender, acute peridia, not fraying at their tip, are characteristic.

spermogonia, aecia

Rosaceae, monophagous

Sorbus aucuparia, chamaemespilus, domestica, hybrida, intermedia, latifolia, mougeotii, umbellata.

For a closely similar gall on Sorbus torminalis see Gymnosporangium torminali-juniperini.

telia on Juniperus

Gymnosporangium cornutum: teliospores

Juniperus communis, from González-Fragoso (1925a): teliospores

gall

telia on green, young branches that show few signs of galling; pulvinate, 1-3 mm, chocolate brown at first, later turning orange. When moistened they don’t swell strongly. Spores two-celled with 1-3 germination pores per cell, each one capped by a hyaline papilla.

telia

Cupressaceae, monophagous

Juniperus communis, rigida.

synonyms

Gymnosporangium aucupariae-juniperini Klebahn; G. juniperinum: Gäumann (1959a).

parasite

Tuberculina persicina.

references

Bahcecioglu & Kabaktepe (2012a), Bellmann (2012a), Blumer (1946a), Brandenburger (1985a: 29), Buhr (1964b), Chinery (2011a), Coulianos & Holmåsen (1991a), Doppelbaur & Doppelbaur (1973a), Erdoğdu, Hüseyin & Suludere (2010a), Gäumann (1959a), González-Fragoso (1925a), Helfer (2005a), Henderson (2000a, 2004a), Jage, Klenke, Kruse oo (2016a), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Koops (2013a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Llorens i Villagrasa (1984a), Maier, Begerow, Weiß & Oberwinkler (2003a), Negrean (1997a), Pellicier (2001a), Poelt & Zwetko (1997a), Preece & Hick (1994a), Redfern & Shirley (2011a), Roques, Cleary, Matsiakh & Eschem (2017a), Roskam (2009a), Ruszkiewicz-Michalska (2006a), Schmid-Heckel (1985a), Termorshuizen & Swertz (2011a), Tomasi (2014a), Unamuno (1941a), Vanderweyen & Fraiture (2008a), Wilson & Henderson (1966a), Woods, Stringer, Evans & Chater (2015a).