Term: marsh horsetail: scouring-rush horsetail widely distributed in wet or boggy areas of northern hemisphere
Broader: horsetail: perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in northern hemisphere; some in Africa and South America | Unrelated: cortinariaceae: a family of fungi belonging to the order Agaricales