This is a genuine image of a cross section of grass leaf under a microscope. No part of the leaf is "smiling" in any literal sense, of course, but the round features known as "vascular bundles" do ...

A microscope image shows the surface of a Kapur Paya fossil leaf. Tiny pores called stomata and the outer skin cells of the leaf are visible, which helps scientists compare it to living trees.

“We report the discovery of grass bedding used to create ... Scanning electron microscope image of a cave sample, showing prickles and stomata. Image: L. Wadley Interestingly, the researchers ...

Much later, grasses branched out and successfully adapted to different environments. Grass stomata are unique: linearly aligned, with dumbbell-shaped guard cells, and more efficient. Raissig ...

The paper, by M.T. Raissig at Stanford University in Stanford, CA, and colleagues was titled, "Mobile MUTE specifies subsidiary cells to build physiologically improved grass stomata." ...