The sclerenchyma lying on the lower side of the primary bundles are contiguous with the bundle, while those above are separated from the bundle by the chlorophyllous layer. (See fig. 55.) In the case of secondary and tertiary bundles the sclerenchymatous bands lying on the lower side are in contact with the chlorophyllous layer, whereas the upper bands are either in contact with this layer or separated from it by a few parenchymatous cells. All the vascular bundles in the leaves of _Eragrostis Willdenoviana_ are provided with sclerenchyma on both the sides. 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. In the secondary bundles the sclerenchyma band above is separated from the chlorophyllous layer by two layers of parenchyma. In the case of the leaves of _Panicum flavidum_, _P. colonum_, _P. fluitans_ and _Pennisetum cenchroides_ the sclerenchyma is separated from the chlorophyllous layer by layers of parenchyma. [Illustration: Fig. 56.--Transverse section of a part of the leaf of Eragrostis Willdenoviana. x 30 1. Vascular bundle; 2. sclerenchyma; 3. motor cells.] [Illustration: Fig. 57.--Transverse section of a portion of the leaf of Eragrostis Willdenoviana. x 150 1. Motor cells; 2. stomata; 3. sclerenchyma; 4. chlorophyllous layer; 5. vascular strand cut through; 6. hair.] [Illustration: Fig. 58.--Transverse section of a part of the leaf of Panicum colonum. x 30 1. Vascular bundle; 2. sclerenchyma; 3. motor cells.] Even from the few examples dealt with above, it is obvious that the range of variation of sclerenchyma in leaves is very great. In the leaves of _Aristida setacea_ there is a considerable amount of sclerenchyma whilst in some leaves such as those of _Panicum_ _colonum_, _P. flavidum_ and _Panicum fluitans_ the sclerenchyma is reduced to its minimum. [Illustration: Fig. 59.--Transverse section of a part of the leaf of Panicum fluitans. x 30 1. Vascular bundle; 2. sclerenchyma.] In the leaves of grasses growing in dry situations the development of sclerenchyma is generally very considerable. The grass _Aristida setacea_ is a good example of a xerophytic grass. The sea-shore grass _Spinifex squarrosus_ is another example of the same kind. But in the leaves of this grass, the development of sclerenchyma is not very considerable, but there is a great development of parenchymatous cells free from chlorophyll within the leaf, the chlorophyll bearing cells being confined to the upper and the lower surfaces of the leaves. [Illustration: Fig. 60.--Transverse section of a leaf of Spinifex squarrosus. x 10 1. Vascular bundle; 2. sclerenchyma.] [Illustration: Fig. 61.--A portion of the transverse section of the leaf of Spinifex squarrosus. x 60 1. Sclerenchyma; 2. vascular bundle; 3. epidermis; 4. stomata.]