1. Australasian fern with clusters of sporangia on stems of fertile fronds
   - Helminthostachys zeylanica 
2. Any fern of the genus Osmunda: large ferns with creeping rhizomes; naked sporangia are on modified fronds that resemble flower clusters
   - osmund

Derived forms: flowering ferns

Type of: fern

Part of: genus Helminthostachys, genus Osmunda, Helminthostachys

Encyclopedia: Flowering fern

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