•  In the leaf  blade, there is only one tissue--the Mesophyll.  It is mostly made up of  folded paranchyma cells.  These cells are  densely packed with chloroplasts, which give the dark green appearance.

• In the leaf sheath,  you can find lots of air spaces between vascular bundles.  These air spaces connect stomata on the epidermis and air spaces in the mesophyll to provide a pathway for efficient air passage.  Some of them are filled with branched parenchyma cells which contain very few chloroplasts, as shown in the following pictures.

Note that the mesophyll of the leaf blade appears to be dark green.  It is because the parenchyma cells in the tissue are filled with chloroplasts for photosynthesis.

In contrast to the blade, the chloroplasts are concentrated to the outside of the sheath.  The aerenchyma tissue is composed of mostly air spaces.  Some of these air spaces are filled with branched parencyma cells, as shown in the picture below.

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