Cronartium ribicola Fischer, 1872
gall
Extensive swellings of the branches with bright yellow pea-sized aecia. Often resin is dropping down the swelling.
spermogonia, aecia
Pinaceae, monophagous
Pinus aristata, cembra, flexilis, monticola, strobus.
Exclusively on species with 5 needles.
on herbs and shrubs
Ribes rubrum, Dronten: uredinia © Arnold Grosscurt
underside of another leaf with larvae, probably of the cecidomyiid genus Mycodiplosis, specialized on feeding on spores of rust fungi
Ribes nigrum, Nieuwendam: the spores are squeezed out of the telia
teliospores
Ribes spec., Belgium, prov. Antwerp, Meerhout © Carina Van Steenwinkel
telia
a single telium
Rubes nigrum, from González-Fragoso (1925a): uredinium (section)
the teliospores germinate already in the telium: on each of four (three visible) short stalks, “sterigmata” after meiosis a spore is formed.
gall
uredinia hypophyllous, 0.3 mm large yellow pustules, covered by a peridium with a round central pore; spores orange, 21-25 x 13-18 µm, spinulose. The teliospores are 1-celled, elliptic, 30-70 x 10-21 µm. They stick together, and are squeezed out as a waxy thread of up to 1-2 mm.
uredinia, telia
polyphagous
Asclepias incarnata; Bartsia alpina; Mentzelia lindleyi; Nasa triphylla; Ribes alpinum, americanum, aureum, nigrum, petraeum, rubrum, sanguineum, speciosum, spicatum, uva-crispa; Tropaeolum majus.
Hyperparasite of the uredinia
references
Afshan, Khalid & Niazi (2012a), Beenken & Senn-Irlet (2016a), Blumer (1946a), Brandenburger (1985a: 23, 219), Buhr (1965a), Ellis & Ellis (1997a), Gäumann (1957a), González-Fragoso (1925a), Henderson (2000a, 2004a), Jage, Kruse, Kummer ao (2013a), Kaitera & Hiltunen (2012a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2014a, 2019a), Kruse & Jage (2014a), McTaggart, Geering & Shivas (2014a), Maier, Begerow, Weiß & Oberwinkler (2003a), Melgarejo Nárdiz, García-Jiménez, Jordá Gutiérrez ao (2010a), Mułenko, Piątek, Wołczańska ao (2010a), Negrean (1997a), Negrean & Anastasiu (2006a), Poelt & Zwetko (1997a), Preece & Hick (1994a), Redfern & Shirley (2011a), Riegler-Hager (2002b), Ruszkiewicz-Michalska (2006a), Skuhravá & Skuhravý (2009d), Termorshuizen & Swertz (2011a), Vanderweyen & Fraiture (2007a), Woods, Stringer, Evans & Chater (2015a).