座延羊齿属(学名:Alethopteris),又名座延种子蕨属、耳羊齿属,是一属已灭绝的种子蕨,生存于石炭纪晚期至二叠纪早期。它们生长在炎热沼泽地带的高处。其化石分布于全世界。[2]
2 sources
特征
座延羊齿的典型植株高度约为5公尺。具有大型的羽状复叶,齿状的小叶基部全部著生于羽轴上,基部下延于轴,呈耳状,故又名为“耳羊齿”。叶脉简单,仅具明显的中央脉和与其垂直的小叶脉。[2][3]
1 sources
物种[1]
- Alethopteris valida Boulay, 1876
参见
参考文献
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