A native plant cell (PO:0025606) that is dead at maturity, lacks specialized wall thickenings or lignin, and has tapered ends that are thin and partially hydrolyzed. [source: ISBN:0962073342, ISBN:376821110, POC:Laurel_Cooper]
Comment
Hydroids are water and mineral conducting cells found in bryophytes in axes and leaves in the gametophytic phase and in the seta in the sporophytic phase.