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-- PRESENTATIONS 59Table 1. Proposal for the delimitation of selected stands according to cork qualityStands H ; Ks R A Kf If Ic No. P1 P2 P3 P4Gasa de Tablas t 16.8 4.4 1.7 2.3 4.5 22.4 14.1 53 22.6 26.4 22.6 28.3Loma del Tiz6n 15.6 4.3 1.4 2.7 5.0 23 14.5 28 17.9 25 25 32.1GuevadelAcebuche 11.7 1.8 1.7 1.9 1.9 16.6 7.4 30 10 10 0 80Gerro Botijero 15.3 4.0 2.3 1.8 6.2 23.9 8.7 28 6.2 10.4 14.6 68.7Los Teatinos 13.1 4.2 2.3 1.9 1.4 15.3 8.2 44 13.6 2.3 13.6 65.9(testigo)The selected stand.t1: Variables: H: mean height (m)Ks: surface coefficientR: 'rugosity' of the trunkA: cracking of the barkKf: shape coefficientIf: phenotypic indexIc: cork quality indexNo.: number of trees analyzedP1: percentage of trees with Ic > 20P2: percentage of trees with 20 > Ic > 15P3: percentage of trees with 15 > Ic > 10P4: percentage of trees with 10 > Icrelevant characters aimed at its ultimate use in seed orchards or in controlledcrossings. On the other hand, techniques of vegetative propagation must beimproved. The well-known difficulties of this kind of propagation are even worsein our case, because mainly older trees were selected. It is also important todevelop a method for characterization of cork quality by means of histologicalparameters. This would make it unnecessary to wait for cork extraction and newselections and tests would be easier, earlier and faster, not to mention thatheritability could be assessed more directly.