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Term Definition
Cellular endosperm A type of endosperm development in which cell walls develop starting with the first cell division.
Endosperm The energy-rich food supply of the seed that is formed by the fusion of the sperm and polar nuclei of the female gametophyte, initially surrounds the embryo, and is often apparent in the seed; some seeds, however, do not have any apparent endosperm. Aril and ruminate endosperm of Myristicaceae. Photos by C. A. Gracie.
Endosperm The energy-rich food supply of the seed that is formed by the fusion of the sperm and polar nuclei of the female gametophyte, initially surrounds the embryo, and is often apparent in the seed; some seeds, however, do not have any apparent endosperm. Endosperm at early seed development. Photo by S. A. Mori.
Helobial endosperm A type of endosperm in which two unequal cells develop differently, the larger one in a noncellular manner (see nuclear endosperm) and the smaller one in various ways. Endosperm at early seed development. Photo by S. A. Mori.
Nuclear endosperm Endosperm development in which many nuclei develop before cell walls are formed. Endosperm at early seed development. Photo by S. A. Mori.
Ruminate endosperm Testa or seed coat folded into the endosperm; e.g., that of many species of Annonaceae, Myristicaceae, and Arecaceae. Aril and ruminate endosperm of Myristicaceae. Photos by C. A. Gracie.