There are plant tissue culturists all over the world!! See the map below developed by Frank Tromble. Please contact Frank at fbt@frankandjackie.com with the information you would like to have in your placemarker. It is a good idea to list the plants you are interested in.
If you want members to contact you, let Frank know and he'll add your email address in your push-pin. Otherwise direct them to the Home Plant Tissue Culture forum on Yahoo.
http://tech.groups.yahoo.com/group/hometissueculture.