In article <Pine.3.89.9409151450.A3144-0100000 at unixg.ubc.ca>, mschmidt at UNIXG.UBC.CA (Monica Schmidt) writes: You may wish to contact Kathryn Louis at 11 West 36th Steet, Mpls., MN 55408. She is very knowlegeable in tissue culture propagation of woody ornamentals and may have worked on poplar. I belive she is working at the University of Minnesota.