Occasionally the mucronate distal end appears to be the result of intentional termination of serrating at the distal end.
From time to time the surface of the absorbent is renewed by serrating it with a comb-like instrument.
serrate ser·rate (sěr'āt') or ser·rat·ed (-ā'tĭd)
Having or forming a row of small, sharp, projections resembling the teeth of a saw.
Having a saw-toothed edge or margin notched with toothlike projections.