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File:Gall on nettle - geograph.org.uk - 947367.jpg

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The cluster-cups shown here produce asexually-formed "aeciospores" (stage I of the life-cycle); inspection through a hand-lens will often show that some of these discs have a yellow powdery mass adhering to them, made up of spores that have emerged from the discs.
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Gall on nettle. This gall is very common on nettles, and can appear on the stem, leaf stalk, leaf, or the (very small and inconspicuous) flowers of the plant. The gall is caused by a fungus, Puccinia urticata ("nettle rust", or "nettle clustercup rust").
964:== {{int:filedesc}} == {{Information |description={{en|1=Gall on nettle This gall is very common on nettles, and can appear on the stem, leaf stalk, leaf, or the (very small and inconspicuous) flowers of the plant. The gall is caused by a fungus, Puccinia 235: 43: 427:– You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. 129:
Aside from causing obvious swelling, the gall can be seen to be dotted with numerous so-called cluster-cups, which have orange discs and a paler yellow margin; these cups are called "aecia" ("aecium", singular).
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spore are said to be macrocyclic; those that do not are microcyclic. Puccinia urticata is a macrocyclic rust; two of its five stages are hosted on nettle, while the other three are hosted on a species of sedge.
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As "British Plant Galls" (Redfern, Shirley & Bloxham; 2002) states, "it seems likely that, amongst all living things, the rust fungi have the most complex life cycles and nuclear arrangements".
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on the Geograph website for the photographer's contact details. The copyright on this image is owned by
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This specimen was on a plant growing beside the path shown in
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55° 58′ 46″ N, 4° 36′ 59″ W
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55° 58′ 47″ N, 4° 36′ 58″ W
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File:Gall on nettle - geograph.org.uk - 947367.jpg
Gall_on_nettle_-_geograph.org.uk_-_947367.jpg
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916482
geograph.org.uk
Lairich Rig
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55° 58′ 47″ N, 4° 36′ 58″ W
Kartographer map based on OpenStreetMap.
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55° 58′ 46″ N, 4° 36′ 59″ W
Kartographer map based on OpenStreetMap.
OpenStreetMap
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