No photo loaded up Wayne - but yes such structures have been reported from members of Leptospermum scoparium complex from wetlands in the South Island as well. I cannot remember the literature but it was Peter Wardle, Allan Mark or Colin Burrows who wrote about them. I have seen them in the "Wakato Peat Bog" race at Opuatia, Whangamarino, Kopouatai and Hinehopu Mires.