. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 391 thejpower to 'grow and form a tissue that supplements the anti- podal cells^and'so]takes the place of the nourishing gametophyte of the gymnosperms. According to this view, the endosperm is a delayed prothallial growth which does not take place until fertilization is effected. There is considerable evidence to justify. Fig. 271. Section of a megasporangium of lily, showing the mature female gametophyte: 9, female gamete, below which are two synergids; p, the two polar nuclei uniting to form the endosperm nucleus; a, antipoda
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 391 thejpower to 'grow and form a tissue that supplements the anti- podal cells^and'so]takes the place of the nourishing gametophyte of the gymnosperms. According to this view, the endosperm is a delayed prothallial growth which does not take place until fertilization is effected. There is considerable evidence to justify. Fig. 271. Section of a megasporangium of lily, showing the mature female gametophyte: 9, female gamete, below which are two synergids; p, the two polar nuclei uniting to form the endosperm nucleus; a, antipodal cells; mi, micropyle; i, integuments; /, funiculus in which a vascular bundle, v, has been formed to transport foods to the sporangium. this conclusion. In the Pteridophyta the archegonia are formed at the close of the prothallial development. Among the species of the Gymnospermae there, are several examples indicating that the archegonia are formed at earlier and earlier stages in the development of the gametophyte (p. 367). Possibly we have in the Angiospermae a final condition where the homologues of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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