any of several spore-bearing aquatic or marsh plants having short rhizomes and leaves resembling quills; worldwide except Polynesia
例句与用法
1.
A very small tongue - shaped flap of tissue inserted on the upper surface of the leaves ( microsporophylls ) and sporophylls of certain clubmosses ( e . g . selaginella ) and quillworts ( isoetes ) 某些石松门（如卷柏）和水韭类植物（水韭属）的孢子叶上具有的一种极小的舌状结构， 。
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