Canna leaf, finger-like aerenchyma
contain large numbers of stellate aerenchyma cells, which traverse the large
intercellular spaces that are found in the petiole and midrib of this leaf. These cells
have many arms, or projections, which effectively forms a large three-dimensional
network of intercellular spaces within the leaf This airspace facilitates
buoyancy as well as gas exchange. The aerenchyma shown in the micrograph was observed near
the midrib of the leaf (see red circle below for the approximate location of the
aerenchyma cells seen in this photomicrograph).