Who discovered non-vascular plants?

That is like asking “Who discovered trees?”. Mosses and liverworts have been known since antiquity. Nonvascular plants are found pretty much everywhere people are, and are pioneer species on newly exposed land. read more

Moss, (division Bryophyta), any of at least 12,000 species of small nonvascular spore-bearing land plants. Mosses are distributed throughout the world except in salt water and are commonly found in moist shady locations. read more

Liverworts are non-vascular plants. Their shape resembles a liver. They are the most basic living plants ranging in size from 0.02 to over 8 inches in diameter. They are one of the first plants to evolve from a sea plant to a land plant 400 million years ago. read more