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, dalechampi, 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).

mod 10.xi.2017