瓶爾小草亞綱（學名：Ophioglossidae）是鏈束植物四個亞綱之一。本亞綱已知有松葉蕨科和瓶爾小草科兩科，分屬松葉蕨目和瓶爾小草目兩目。松葉蕨綱是其他蕨類植物（包括合囊蕨科與木賊科）的姊妹群。
演化樹
| 鏈束植物 Polypodiopsida |
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參考文獻
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