Portuguese [Quercus robur] forests

Relict forests of [Quercus robur] of central Portugal, often mixed with [Quercus suber], [Quercus pyrenaica] or [Castanea sativa] and with a luxuriant understory rich in lauriphyllous and xerophyllous lustrous-leaved shrubs and small trees such as [Prunus lusitanica], [Arbutus unedo], [Viburnum tinus], [Ilex aquifolium], [Laurus nobilis], [Myrtus communis] and [Ruscus aculeatus], limited to the basins of the Mondego and the Zezere, reduced to a very few, extremely fragile stands of exceptional biological and aesthetic value.