Table 1 Average values of Young’s modulus E, critical surface tension σ_k, Poisson’s ratio v, and the force to tear f_t of maple leaves Acer platanoides L. and lime leaves Tilia cordata Mill., determined in consecutive seasons of the year; V - May (spring), VIII - August (summer), X - October (autumn).

V

4.06 ± 0.80^a

1.01 ± 0.25^a

0.50 ± 0.07^a

0.38 ± 0.07^a

VIII

24.13 ± 2.53^b

16.57 ± 2.37^c

1.56 ± 0.20^c

1.04 ± 0.13^c

X

21.01 ± 4.17^b

10.67 ± 0.69^b

1.24 ± 0.12^b

0.68 ± 0.12^b

Maple

Lime

Maple

Lime

V

0.44 ± 0.05^a

0.52 ± 0.05^a

0.21 ± 0.03^a

0.14 ± 0.05^a

VIII

0.49 ± 0.04^b

0.51 ± 0.06^a

0.50 ± 0.03^b

0.38 ± 0.05^c

X

0.49 ± 0.03^b

0.51 ± 0.04^a

0.52 ± 0.06^b

0.25 ± 0.04^b