chlorophyllous

In a well developed large vascular bundle the chlorophyllous layer is open below just close to the sclerenchymatous band.

In the secondary bundles the sclerenchyma band above is separated from the chlorophyllous layer by two layers of parenchyma.

The lower band of the primary vascular bundles is continuous with the vascular bundle, the chlorophyllous layer being open below.

The upper bands of the primary and the lower bands of the secondary vascular bundles just touch the chlorophyllous layer.