Lack of vascular tissue limits them to moist habitat and small size. Water and nutrients distributed by osmosis. Maybe polyphyletic Gametophyte is dominant Bryophytes used in plant studies because they re easy to grow and small. Moss gametophytes are small, leafy shoots with rhizoids to anchor to soil. Phylum Bryophyta Lack true leaves, roots, stems because they don t have vascular tissue.
Some mosses have conducting cells that function like the vascular tissue of higher plants.
Gametophyte is dominant, green, photosynthesizes. The gametangia are at the tips of gametophyte shoots. Flagellated sperm get to archegonium by raindrops, insects etc. Fertilize the egg inside the female archegonium. Archegonium secretes sucrose to attract the sperm.