This is an amazing hat, isn't it? It is made up of fibre cells, covering a head-shaped vascular bundle in a leaf of a velvet grass (Holcus lanatus, #Poaceae). #PlantAnatomy
The whole leaf looks like that. It is circular, because it is a sheath around the stem (at least the lower part). #Poaceae #PlantAnatomy
This picture is ugly, but you can see the leaf encircling the stem. #Poaceae #PlantAnatomy