1) Cousin of a tendril 2) Ivy attacher 3) Ivy offshoot 4) Plant part 5) Radicel 6) Radicle 7) Rhizoid 8) Root 9) Small division of a plant 10) Small plant support 11) Small plant-part 12) Small tuber 13) Small tuber extremity 14) Tiny plant part 15) Underground branch 16) Underground water carrier Found on https://www.crosswordclues.com/clue/rootlet