A Morphogenetic Approach to the Embryogeny of Indotristicha (Podostemaceae)

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Abstract
Embryogenesis in Indotristicha ramosissima presents a unique instance where exomorphic development marches ahead of endomorphic differentiation. Embryonic key centres of metabolic activity such as the epiphysis, the hypophysis and the cotyledonary loci are recognized largely by their topographical positions rather than on histological characteristics. The growth of the cotyledons is also atypical in that an arc of protodermal and the subjacent hypodermal cells at the apex of the appendage become involved in the attainment of the mature size and form. A postulate is presented which recognizes the interaction of two sets of factors in embryogenesis: one responsible for the attainment of the exomorphic contour and the other for endomorphic differentiation.

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