I found this picture online claiming it was a grass cell. Clearly it is a cross section image but I was hoping you could tell me if this is actually grass, or something else if anything.
It's not a single grass cell, but this does indeed appear to be a micrograph of a leaf of grass—so it actually contains numerous cells. Here's another image I was able to find with a much more clear description of exactly what you're seeing:
Marram grass leaf. Light micrograph of a cross section through a closed (unravelled) leaf of Marram grass, Ammophila arenaria. The deeply grooved leaf is thrown into folds (seen here) and it uncurls when mature so that the folds do not face the centre. The folds conserve water and withstand salt, and prevent excessive evaporation. Round vascular bundles are visible inside each fold, serving to transport food and water through the leaf. Spines on the surface discourage animals from eating the leaf. Marram grass is important in coastal ecology, since it is one of the commonest grass species in Britain to stabilize sand dunes. Magnification: x22 at 35mm size. (Emphasis added)
And here's another:
Transverse section of Marram Grass leaf , showing adaptations to prevent water loss; outer thick cuticle, curling by means of hinge cells to protect inner epidermis, stomata sunken into surface to maintain high humidity
The coloration yielding the yellow 'happy faces' is artificial, either due to staining or direct post-processing of the image.
This is a transverse section (T.S.) of leaf blade a sort of Xerophytic (Desert-climate) grasses. such as Ammophila arenaria , Spartina sp, Agropyron sp, Poa pratensis etc. However similar-type-adaptation also seen in other (not-grass) plants.
It is T.S. of an object like this.
The 2 sides of the leaf develop into different structure. The adaxial ("upper") surface, which in its underneath contain the the soft, green tissue, and the abaxial ("bottom") surface which contains more sclerotic tissue.
Normally, when dry-period runs, the leaf remains rolled in an way, so that soft side stay inwards , concave manner, closed, protected from evaporation. The outer, convex abaxial-face acts as a shield.
When rains come; the leaf work in a manner of bimetallic-strip. The inner (adaxial) surface absorbs water and expands (the "hinge cells" help it); and the inner-face become open. Then the inner-face work as a water-absorption tissue.
When dry-period come-again, the leaves enter their original state.
The whole diagram (Colors not realistic. Either The specimen is stained; or image has been processed after photograph) with pointing, is like this.
Ammophila arenaria , from A Textbook of Plant Ecology / Shukla and Chandel.
Reference : A textbook of Plant-ecology by Shukla and Chandel; S.Chand
College Botany, Vol-1 by Gangulee, Das, Datta; New central book agency .
Studies in botany, Vol-2, by Mitra , Guha , Chowdhuri; Moulik Library Kolkata