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Rhynia gwynne-vaughanii: epidermis and stoma

Stoma of Rhynia

Epidermis with stoma.

Stoma of Rhynia

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

Stem of  Rhynia

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

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