A new species, Lindsaea pietrobomii (Lindsaeaceae), from the Brazilian Amazon is described and illustrated. It differs from the other simple-bladed species of the genus by having the base of the leaf blades obtuse when juvenile and cuneate when mature (never with sinus), the blades flabellate, and the costa up to one-fifth the blade length. An identification key for the simple-bladed species of Lindsaea is also provided.

中文翻译：

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来自巴西亚马逊的林德科（Lindsaeaceae）一新种

描述并说明了来自巴西亚马逊地区的一个新物种 Lindsaea pietrobomii（Lindsaeaceae）。它不同于该属的其他单刃物种，幼时叶片基部钝，成熟时楔形（从未有窦），叶片扇形，肋骨长达叶片长度的五分之一。还提供了 Lindsaea 单叶物种的识别密钥。