Rhynia gwynne-vaughanii: epidermis and stoma

Epidermis with stoma.

The same stoma enlarged: diameter of the stoma 50 µms.
Notice the two guardcells.

In the centre you can see the epidermal cells from above.
Notice the ledge on each cell.

The stem surface of Rhynia gwynne-vaughanii,
taken on a fracture in the rock.
Width of the stem 1.3 mms.