The physical characteristic that is the main difference between the Bryophytes and members of the Lycophytes and Pteridophytes is the presence of .

Vascular tissues

Explanation:

The bryophytes are the plants that lack vascular tissues called as xylem and phleom. The bryophytes vary in diversity these includes the simple plants like mosses, liverworts and hornworts. These plants obtain the water and nutrients through the process of simple diffusion. The bryopytes absorb the water and nutrients at the surface of soil and transport them through cell to cell contact. The lycophytes and pteriodophytes are the vascular plants as they posses the xylem and phloem.