que06 | J. Pallas prefers to separate northern and southern temperate forests at the level of alliances (Pallas in Bohn et al. 2003: 250−253). However, the floristic differences between these two units (Molinio-Quercion roboris and Quercion roboris s.str., respectively) are rather weak and perhaps more appropriate to be recognised at the suballiance level. (W. Willner).