Ulmus of King & Co nursery, Rayne, are elms grown from cuttings taken in the early 1990s from two[1][2] to four[3] old trees (accounts vary) surviving in north Essex, England, amidst others afflicted by Dutch elm disease (DED).

[3][1] A 2010 genetic test referred to them as "English Elm (U. procera)", an identification presumably supplied by the nursery itself.

The Lynfields elm, Witham, the second of the source trees, has shallow-toothed, elliptical short-shoot leaves (without prominent drip-tip), 2 to 2.5 in long and 1.5 to 2 in wide, on quarter-inch petioles, and vertically-fissured overlapping bark unlike that of old U. procera.

[12] All 11 specimens inoculated with the DED pathogen by Dr Jelle Hiemstra, Wageningen University, in the 2015 Noordplant trials in the Netherlands, died rapidly.

[13] A degree of 'field resistance' has been noted in a small number of old field elms in areas of high infectivity.