Cronartium quercuum (Berkeley) Miyabe, 1899
on Pinus
gall
aecia on the branches, bark or cones, forming cushionlike crusts, up to 30 cm large, with a fraying peridium. Spores 25-50 x 15-23 µm, coarsely tuberculate.
spermogonia, aecia
Pinaceae, monophagous
Pinus densiflora, sylvestris, virginiana….
on Quercus
gall
uredinia hypophyllous, 0.25 large yellow, semiglobular with a central pore; spores 20-32 x 14-20 µm, spinulose. Teliospores (in Europe extremely rare) elliptic, 26-60 x 10-23 µm, sticking together, squeezed out as a thread of a few mm long.
uredinia, telia
Fagaceae, oligophagous
Quercus coccifera, dalechampii, ilex, petraea, palustris robur, rubra.
Outside of Europe als on Castanea, Fagus.
synonyms
Uredo quercus Brondeau, 1830.
notes
The bundles of telia are often parasitised by the hyperparasitic fungus Cladosporium uredinicola.
references
Bahcecioglu & Kabaktepe (2012a), Brandenburger (1985a: 63), Ellis & Ellis (1997a), Gäumann (1959a), González-Fragoso (1925a), Henderson (2004a), Klenke & Scholler (2015a), Moricca, Ragazzi, Mitchelson & Assante (2001a), Negrean (1997a), Termorshuizen & Swertz (2011a), Vanderweyen & Fraiture (2007a), Wilson & Henderson (1966a), Woods, Stringer, Evans & Chater (2015a).