



* 



444 BOTANICAL GAZETTE [December 



To Dr. W. P. Thompson I am greatly indebted for his constant 

 interest and advice, and also for all material used in this investiga- 

 tion. 



University of Saskatchewan 



Canada 



LITERATURE CITED 



i« Bower, F. O., The germination and embryology of Gnetion Gnemon. 

 Quart. Jour. Micr. Sci. 22: 278-298. 1882. 



2. Buchholz, J. TV, Polyembryony among Abietineae. Bot. Gaz. 69: 

 153-167. 1920. 



3. Coulter, J. M., The embryo sac and embryo of Gnetum. Bot. Gaz. 46: 

 43-49. 1908. 



Coulter, J. M., and Chamberlain, C. J 

 University of Chicago Press. 191 7. 



Land, W. J. G., Spermatogenesis and ooge 



Gaz. 38: 1-18. 1904. 



Thompson, W. P., Morphology and afti 



Bot. 



J 



Bot. 4: 135-184. 1916. , 



EXPLANATION OF PLATES XXXIX-XLI 



PLATE XXXIX 



Fig. 1. — G. funiculare: proembryo, showing suspensors emerging; S, sus- 

 pensors; pt, pollen tube; semi-diagrammatic reconstruction; X50. 



Fig. 2. — G. funiculare: proembryo, showing variation of fig. 1; semi- 

 diagrammatic reconstruction; X50. 



■ 



Fig. 3. — G. funiculare: branching of tubes; oe, outside of endosperm; con- 

 nections in broken lines not determined with certainty; semi-diagrammatic 

 reconstruction. 



Fig. 4. — G. sp. 29: part of bundle of tubes measuring 27, mm.; X25. 



Fig. 5. — G. sp. 15: swollen tips of tubes turning about; X25. 



Fig. 5a. — G. sp. 15: group of nuclei from tube marked X; X47 



Fig. 6. — G. sp. 59: embryo forming from chain of cells in secondary 

 cells (5) of secondary suspensor; X215. 



Fig. 7. — G. sp. 59: branch of secondary suspensor; X107.5. 



PLATE XL 



Fig. 8.— G. f 

 Fig. 9. 



sp. 29: tip of primary suspensor, showing peculiar cell ; X 

 9<J- — G. sp. 29: large nucleus of suspensor shown in fig. 9; X4 2 5 



Fig. 10. — G. sp. 59: shortened end cell moving out of surrounding proto- 

 plasm; p, shrunken protoplasm of tube; w, wall; X425. 



10a. — G. sp. 59: same under lower magnification; X50. 









11 



