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There are three posts, only, of this, which is quite surprising here. I have seen it myself but thought nothing of it!
It is poorly recorded Worldwide http://www.gbif.org/species/5427485
It is, of course caused by a bacteria, so technically is not a Plant. I have agreed based on the photo, as it an unusual feature, obviously then not a natural piece of the tree arising from, say, damage.
Lat/Lng: 54.71509, -1.6999
OS grid ref: NZ194356