Assertion: stoma | /r/HasAspect | two guard cells
Facets:
Source sentences:
text: stomata have two guard cells in one layer with only ordinary epidermis cells, but with two subsidiary cells on the outer surface of the epidermis, arranged parallel to the guard cells, with a pore between them, overlying the stoma opening.
text: stomata have two guard cells that are entirely encircled by one continuous subsidiary cell (like a donut).
text: stomata have two guard cells that are entirely encircled by one subsidiary cell that has not merged its ends (like a sausage).