Hi! Check the following.

A protocol for Ulmus minor Mill. micropropagation and acclimatization

http://link.springer.com/article/10.1007/s11240-007-9310-8

Micropropagation of Mature Trees of Ulmus Glabra, Ulmus Minor and Ulmus Laevis

https://www.researchgate.net/publication/226569010_Micropropagation_of_Mature_Trees_of_Ulmus_Glabra_Ulmus_Minor_and_Ulmus_Laevis

Micropropagation and Regeneration of English Elm, Ulmus procera Salisbury

http://jxb.oxfordjournals.org/content/44/7/1211

Micropropagation of Ulmus minor and U. minor x U. pumila from 4-year-old ramets

http://www.inia.es/gcontrec/pub/249-254-(22)-Scropropagatio_1161943916281.pdf

Ulmus micropropagation

http://www.ncbi.nlm.nih.gov/pubmed/?term=Ulmus+micropropagation

Chapter Micropropagation of Mature Trees of Ulmus Glabra, Ulmus Mino...

Thank you very much for your time and assistance Jetty!