PPT Slide
Jussiaea peruviana (tropical)
A. mud roots (m.r.) and the adventitous roots (a.r.)
B. Transverse section of submerged part of a stem to show aerenchyma (a) which develops from the phellogen (pg). Also shown is the phloem (ph), normal cambium (c), xylem (xy).
From Arber, Agnes 1920 Water Plants. Cambridge University PressWater Plants, p.190.