The minimal area of a foliicolous lichen community of Woessia vasakii in so
uthern France (West Languedoc, Department of Gard) was studied by the metho
d of the mean similarity coefficients of Sorensen and of Kulcinsky. The det
ermination of the qualitative and quantitative minimal areas, which are c.
30-50 cm(2) and 50-80 cm(2), respectively, allows the phytosociological stu
dy of the foliicolous communities of southern France by the method of integ
ral sampling.