Abstract
Epidermal structure and development of stomata are described in seven species and two varieties of Dioscoreaceae and one species of Taccaceae. Epidermal cells are polygonal, isodia-metric or elongated and irregular in outline with thick straight arched or sinuous anticlinal walls. The surface of the cuticle shows parallel striations radiating from guard cells or hair bases. Three types of eglandular and one type of glandular trichomes are noticed. The mature stomata are anomocytic, paracytic, diacytic, transitional between paracytic and diacytic, tetracytic, triacytic, staurocytic, cyclocytic and with a single subsidiary cell. Abnormalities observed are: variously oriented contiguous stomata, cytoplasmic connection between nearby stomata, connecting tube between two superimposed stomata, arrested development, aborted guard cells, single guard cell and division of guard cells. The ontogeny of stomata is haplocheilic or perigenous.
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