Final answer:
The plant is most likely a spore-producing plant, such as a fern or a moss.
Step-by-step explanation:
The plant is most likely a spore-producing plant. Spore-producing plants, such as ferns and mosses, reproduce by releasing spores. The brown dust on the underside of the leaf is most likely a cluster of spores. These plants do not have flowers or seeds like flowering plants.
Learn more about Spore-producing plants