Is this 肠 a mistaken character? Is this 肠 a typo in my book？

这次探明了大石围天坑是集地下溶洞、地下原始森林、珍稀动植物以及地下暗河于一体的世界第二大天坑。 短肠蕨类植物比恐龙时期的桫椤还要古老。

短肠蕨类 ： short intestined fern

Can 肠 refer to the trunk of a tree, the stem of a plant or somehow the length of the leaves??
No, it's not a typo, surely there is a kind of plant called 短肠蕨, the latin name of which is Allantodia.

Details can be found at: http://www.eflora.cn/sp/Allantodia