Summary.-The use of scanning electron microscopy has led to described more precisely the leal trichomes of some perimediterranean Quercus species. This technics more pertormant than the classical optic microscopy show six trichome types. 1 -simple uniseriate. 2 -capitale. 3 -unicellular. 4 -stellate. 5 -fused stellate. 6 -fasciculate. Some of them are restricted to particular species. Basides mature and immature leaves show quantitative and qualitative diHerences. Th en three groups could be distinguished :the deciduous species, the se mi evergreen and the evergreen oaks species.
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