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|Noun||1.||fern ally - pteridophytes of other classes than Filicopsida|
whisk fern - chiefly tropical clump-forming plants of skeletal appearance resembling whisk brooms; lacking roots
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
club moss, club-moss, lycopod - primitive evergreen moss-like plant with spores in club-shaped strobiles
quillwort - any of several spore-bearing aquatic or marsh plants having short rhizomes and leaves resembling quills; worldwide except Polynesia