Inheritance of foliar and nodal anatomical characters in some Ilex hybrids
1978
The diverse relationships of the main differential leaf and nodal anatomical characters of a number ot artificial Ilex hybrids and their parents are compared. The marginal sclerenchyma strands character is not transferred to hybrids when differential. The lignification of the unspecialized abaxial epidermal cells is dominantly inherited, except in one hybrid. The development of a distinctive adaxial hypodermis is usually suppressed in hybrids when one of its parents is lacking in this character. New characters are reported for hybrids of Ilex aquifolium × opaca, where the vasculation of petiole and midrib and the presence of periclinal subdivisions in the adaxial epidermis constitute features not known from either parent species. The possible significance of the four different ways of expression of parental characters in the hybrid offspring is discussed with reference to: genetic control of anatomical characters; the identification of hybrid material; the evolution of leaf anatomical diversity in Ilex, and the systematic value of leaf anatomical characters.
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