A common type of schlerenchyma cell is the fiber. Some sclerenchyma cells occur in the fruits of Pear. View stone cells by clicking here . Xylem cells tend to conduct water and minerals from roots to leaves. Tracheids are long and tapered, with angled end-plates that connect cell to cell.
Vessel elements are shorter, much wider, and lack end plates.
They occur only in angiosperms , the most recently evolved large group of plants. Tracheids, longer, and narrower than most vessels, appear first in the fossil record. Vessels occur later. Tracheids have obliquely-angled endwalls cut across by bars. The evolutionary trend in vessels is for shorter cells, with no bars on the endwalls.