Quillworts are heterosporous, mainly aquatic perennials, with a dense rosette of tubular quill-like leaves arising from a short, stout rootstock.

水韭目具有异型孢子，是多年水生。其管条形叶密集簇生于短根茎之上。

Indusium The flap of tissue, derived from the placenta, that encloses the developing sporangia in the sorus of a fern.

是一种起源于胎座（应为叶表皮译者注）瓣织，覆盖在蕨类孢子囊群中正在发育孢子囊上。