Canna leaf, finger-like aerenchyma

cannapar.tif (1276012 bytes) Canna leaves 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). 

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