Summary
Arabis albida variegata, Euonymus japonica aurea andE. japonica argentea are periclinally variegated plants. They possess a subepidermis which is distinct from the inner tissue at the apex of the shoot and forms a layer of cells one cell thick, except for slight irregularities, over most of the leaf but thicker at the margins. From its development it seems likely that the subepidermis may form the white “skin” which causes the characteristic appearance of these periclinally variegated plants.
The sectorially variegated dicotyledonVeronica gentianoides variegata and the sectorially variegated monocotyledonChlorophytum have a growing point in which the greater part of the stem apex and the young leaves are formed directly from division of subepidermal cells. It would be impossible for the subepidermis to form a white “skin” over the plant in these cases.
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Massey, K. The development of the leaves in certain periclinally variegated plants. Journ. of Gen. 19, 357–372 (1928). https://doi.org/10.1007/BF02983165
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DOI: https://doi.org/10.1007/BF02983165