Author

B.M. JOHRI

Department of Botany, University of Delhi, Delhi 110007

Abstract

Which embryologic characters are primitive, and which ones advanced, has been a controversial issue since long? The comparative embryology of angiosperms and gymnosperms does not provide any useful clue. Single embryological characters are not as useful for and evolutionary considerations as a group of characters. Moreover, some of the characters may be merely adaptive without any evolutionary significance. The numerous variations cause further complication.

This article is devoted to (a) distribution and phylogeny of anther tapetum, (b) affinities of megagametophyte, (C) can the archegoni um in gymnosperms give rise to the angiosperm embryo sac? (d) primitive and advanced embryological features, and (e) embryological freatures in Magnoliiflorae s.l. and certain Liliiflorae.

Key words: Evolution, reproductivebiology angiosperms.

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