Roscndahl: embryology of symplocarpus foetidus. 9 



Fig. 23. Antipodal tissue with large nuclei and darkly staining bodies in 

 the cytoplasm. X 390. 



Fig. 24. Massive suspensor, embryo removed from endosperm. X 720. 



Fig. 25. Embryo with groove in which leaves and plumule appear. X 107. 



Fig. 26. Embryo after groove has closed up and suspensor has been obliter- 

 ated. (Drawn from reconstructed model.) 



Fig. 27. Club-shaped embryo and surrounding endosperm. X 630. 



Fig. 28. Section through ripe fruit showing naked embryos in place. 



Fig. 29. Section through embryo showing suspensor and groove in which 

 the plumule and leaves are to develop. X 107. 



Fig. 30. Archesporial cell, with "tapetal" cell just cut off. X 500. 



Fig. 31. "Tapetum" dividing by an anticlinal wall. X 500. 



Fig. 32. Late stage in the division of the spore-mother cell, spindle still 

 visible. X 500. 



Fig. T)2i- Pollen tube entering ovule through the micropyle. X 220. 



Fig. 34. First division of the spore-mother cell completed. "Tapetum" 

 clearly shown. X 500. 



Fig. 35. Embryo with surrounding endosperm. Nucellar tissue nearly de- 

 stroyed, inner integument breaking down. X 43. 



Fig. 2)^. A more advanced stage than the preceding. Antipodal tissue with 

 large deeply staining nuclei. X 43. 



Fig. 37. Young club-shaped embyro with surrounding endosperm. X 203. 



Fig. 38. Pear-shaped embryo with short suspensor. X 70. 



Fig. 39. Section through the suspensor end of the embyro showing groove 

 and in it the rudiments of leaf and plumule. X 150. 



Fig. 40. Section through mature embyro showing the radicle and vascular 

 bundle leading off into the "cotyledon." Two leaf rudiments 

 axid stem apex are faintly visible. X 38. 



