How do moss leaves differ from leaves of more complex plants?

Moss "leaves" differ from the leaves of more complex plants by having no vascular tissue

and through haploids.

To add, haploid is the term used when a cell has half the usual number of chromosomes. On the other hand, vascular tissue is the tissue in higher plants that constitutes the vascular system, consisting of phloem and xylem, by which water and nutrients are conducted throughout the plant.