D ehnel , G eorge S. (U. Missouri, Columbia.) Abnormal stomatal development in foliage leaves of Begonia aridicaulis. Amer. Jour. Bot. 48(2): 129–133. Illus. 1961.—The results of 2 types of aberrant stomatal development in abaxial epidermis of normal laminae of B. aridicaulis are discussed and illustrated. The more common is a so‐called persistent stomatal initial that is an essentially circular cell (in face view) with chloroplasts and a wall of uniform thickness. The other type of anomalous development yields a single guard cell , which possesses chloroplasts, differential wall thickening, rarely a pore, and a form characteristic of a normally paired guard cell. Both types of cells may either be isolated or occur variably in close relationship to normal stomata.
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George S. Dehnel (1961) studied this question.