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nounany of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by sporestype of:
Definition that contains fern
- bracken fern of southeastern Asia; not hardy in cold temperate regions
- hay-scented fern of eastern North America with pale green fronds and an aroma like hay
- cryptogramma crispa fern of Europe and Asia Minor having short slender rhizome and densely tufted bright green fronds resembling parsley
- dryopteris thelypteris fern having pinnatifid fronds and growing in wet places; cosmopolitan in north temperate regions
- little ebony spleenwort fern of tropical America: from southern United States to West Indies and Mexico to Brazil
- aquatic fern ferns that grow in water
- cystopteris montana fern of rocky mountainous areas of hemisphere
- central american strap fern fern with shorter and narrower leaves than Florida strap fern; Florida to West Indies and Mexico and south to Argentina
- athyrium thelypteroides fern with elongate silvery outgrowths enclosing the developing spores
- male fern fern of North America and Europe whose rhizomes and stalks yield an oleoresin used to expel tapeworms