孢子叶

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

水韭目的具有异型子，是多年水。其管状条形密集簇短的根茎之上。

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

是一种起源胎座（应为表皮译者注）的瓣片状组织，覆盖在蕨类子囊群中正在发育的子囊上。