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This is very common on Lime trees this time of year - they are galls caused by insects laying their eggs on the leaf, then harnessing the plants natural reaction to encase them, to produce a gall to incubate their young in.
On lime trees, the mite that causes them is Eriophyes tiliae. That said other mites can cause similar galls on other plants.
What tidy minds the little beasts must have, three on each side of the leaf, neat - or are they bound by 'egg laying regulations'?
They are nail galls: I get these on my lime tree from time to time
See here: http://www.geograph.org.uk/photo/912681
WOW
thanks for all your replies I will let the lady know tomorrow, I would never of guessed it was a mite
A little bit more here: http://en.wikipedia.org/wiki/Eriophyes_tiliae