Sect. Allantodia (Athyriaceae)
Ⅰ. 短肠蕨组 Sect. Ⅰ. Allantodia ——Brachysorus Presl, Epim. Bot. 70. 1849, pro genere. ——Asplenium Subgen. Pseudallantodia Clarke in Trans. Linn. Soc. ser. 2, Bot. 1: 495. 1880.
形态特征：孢子囊群卵圆形或柱状矩圆形，着生于小脉基部，被肠衣状的膜质囊群盖包围，膨胀呈卵形或短腊肠形，成熟时囊群盖从背部不规则破裂。▽组的模式种：Allantodia australis R. Br.