pillwort

World English Dictionary
pillwort (ˈpɪlˌwɜːt)
 
n
a small Eurasian water fern, Pilularia globulifera, with globular spore-producing bodies and grasslike leaves
 
[C19: from pill1 + wort]

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
pillwort

noun
European water fern found around margins of bodies of water or in wet acid soil having small globose sporocarps 
WordNet® 3.0, © 2006 by Princeton University.
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