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Embryology and possible relationships of Petermannia cirrosa (Petermanniaceae)
Author(s) -
Conran J. G.
Publication year - 1988
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1988.tb01701.x
Subject(s) - megaspore , tapetum , biology , ovule , embryology , botany , anatomy , microspore , stamen , pollen
Conran, J. G. 1988. Embryology and possible relationships of Petermannia cirrosa (Petermanniaceae). ‐ Nord. J. Bot. 8: 13–17. Copenhagen. ISSN 0107–055X. Micro‐ and megasporogenesis in Petermannia cirrosa is reported and the relationships of the Petermanniaceae are discussed. Microsporogenesis is successive; the endothecium is spirally thickened and the tapetum binucleate and amoeboid. The ovules are anatropous and crassinucellate. A primary parietal cell is formed and divides. Megasporogenesis is of the Polygonum type. On the basis of these and other characters, the Petermanniaceae show affinities with the remainder of the Dioscoreales, and also with the Geitonoplesiaceae (Asparagales) but remain somewhat isolated.