Supplementary material from: Tesei G, Allegrezza M, Ballelli S, Ciaschetti G, Console C, Montecchiari S, Ottaviani C, Pirone G, Frattaroli A (2021) The oldest Pinus nigra plantations in the central Apennines: distribution and floristic-vegetational characterisation. Plant Sociology 58(2): 15-28. htt