PISUM SATIVUM 369 



and at the cotyledonary plate, than along the edges of the cotyle- 

 don which are practically without starch, at least in the meriste- 

 matic zone. 



The endosperm never becomes definitely cellular, although tem- 

 porary walls may form around the nuclei adjacent to the embryo 

 as described for Phaseolus by Brown (i). By the time the seed is 

 eleven to twelve days old, the endosperm has been entirely digested. 

 The mature seed consists of the embryo and the seed coat, the latter 

 being developed from the outer integument only, the inner integu- 

 ment being completely digested during the growth of the embryo. 



LITERATURE CITED 



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2.. Brown, M. M., "The development of the embryo-sac and of the embryo in 

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3. BuGNON, P., "Organogenese et dehiscence de la gousse des Papilionacees." 



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4. CoE, H. S., and Martin, J. N., "Sweet-clover seed. Part I. Pollination 



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6. Cooper, D. C, Unpublished results, Univ. of Wise, 1937. 



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584-591, 1938. 



8. Dangeard, p. a., "Recherches sur le mode d'union de la tige et de la racinc 



chez les Dicotyledones." Le Bot. Ser. I: 75-115, 1889. 



9. Fred, E. B., Baldwin, I. L., and McCoy, Elizabeth, "Root nodule bacteria 



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Clarendon Press, Oxford, 1887. 



11. GouRLEY, J. H., "Anatomy of the transition region of Pisum sativum." 



Bot. Gaz- 92: 367-383, 1 93 1. 

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