A precondition for assignment to this habitat type is the occurrence of vegetation of the stated syntaxa in the natural range of pine.

The habitat type is distinguished from the acid-soiled Dicrano-Pinetum pine forests assigned to type 91T0 by the absence or near-absence of acidophile dwarf vegetation and by the degree of coverage with shrubby lichens. Peucedano-Pinetum steppe pine forests often have transitions to lichen-rich, acid-soiled Dicrano-Pinetum pine forests. In such cases, areas should be divided between the two habitat types based on the lichen coverage (habitat type 91U0 for Cytiso-Pinion with under 30 percent lichen coverage and type 91T0) for Dicrano-Pinetum with over 30 percent lichen coverage). Where the two habitat types are closely intermingled, they should be mapped as a single complex and a percentage estimated for each type.

Transitions to habitat type 6210 are included provided they still feature substantial occurrences of the tree and shrub species characteristic to habitat type 91U0.

Pyrolo-Pinetum pine forests on coastal dunes are classified as habitat type 2180.

The Dorycnio-Pinetum (Oberdorfer 57) and Calamagrostio variae-Pinetum (Oberdorfer 57) syntaxa found on high gravel terraces of the alpine foothills and on marl slopes of the alpine margins are not assigned to this habitat type.

Adjoining dry margins should be included together with their vegetation when delineating the area.