In any case, old trees are generally more valuable for biodiversity than young trees (cf above), although for ground-dwelling fungi age may be less important than continuous presence of the associated tree species. Such information, as well as data on stand age or development class, will often be available from forest inventories, thereby allowing a linkage to data on tree biomass and carbon stocks. Annex I lists 81 different forest types of European conservation interest, of which 19 are represented in the EU members of the Nordic countries and seven of these are listed as priority habitat types (Table 4.2).