| Countries | ||
| Austria | Germany | Portugal |
| Belgium | Greece | Romania |
| Bosnia and Herzegovina | Hungary | Serbia |
| Bulgaria | Ireland | Slovakia |
| Croatia | Israel | Slovenia |
| Cyprus | Italy | Spain |
| Czech republic | Latvia | Switzerland |
| Denmark | Lithuania | Turkey |
| Finland | Netherlands | United Kingdom |
| France | Norway | |
| FYR of Macedonia | Poland |
| COST Near Neighbour Countries | |
| Syrian Arab Republic | |
| Morocco | |
| Lebanon | |
| Tunisia | |
| Algeria | |
| Ukraine |
| Specific organisations |
| Bioversity International |
| International Centre for Advanced Mediterranean Agronomic Studies ( |
| Mediterranean Regional Office of the European Forest Institute (EFIMED) |
| Food and Agriculture Organization of the United Nations (FAO) |
| IUFRO working group 2.04.02 |