Table 4.

Average characteristics of leaves of A. marina developed during plant growth in salinities ranging from 25 to 100 % seawater; there were no significant effects of salinity on any of the characteristics listed; n = 12, three replicates per treatment

Leaf feature	Units	Mean value	s.e.
Leaf thickness	µm	675	15
Hypodermal thickness	µm	273	6
Palisade mesophyll thickness	µm	206	8
Spongy mesophyll thickness	µm	101	4
Trichome thickness	µm	96	3
Leaf area	cm2	11·7	1·4
Major vein density	mm mm−2	0·16	0·01
Minor vein density	mm mm−2	11·8	0·5
Stomatal density	mm−2	174	24
Adaxial salt secretion gland density	mm−2	4	1
δ13C	‰	−25·8	0·2