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Statistical analysis of available data on the types of endosperm and of vessel perforation in dicotyledonous taxa indicates that (a) Nuclear-type endosperm is positively associated with porous perforation and that (b) Cellular-type endosperm is negatively associated with such perforation. 2. As it has been well established that porous perforation of the vessel member represents a high degree of phylogenetic specialization, it follows that Nuclear-type endosperm is in all probability more advanced than Cellular-type endosperm.
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Swamy et al. (1957) studied this question.
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