130 BOTANICAL GAZETTE [FEBRUARY 
FIGs. 34, 35. S. integrifolium. Embryo sac with two nuclei. (Cyanin- 
erythrosin.) ; 
Fic. 36. S. integrifolium. Embryo sac with four nuclei; nucellus rup- 
tured. (Saf.-gen.-violet.)_ 
Fic. 37. S. integrifolium. Embryo sac with fusing polar nuclei. (Cyanin- 
erythrosin.) 
Fig. 38. S. integrifolium. Mature embryo sac: ca, nucellar cap; ¥, 
synergidae; 0, oosphere; e#, primary endosperm nucleus; am, antipodal 
cells. (Saf.-gen.-violet.) 
PLATE VI 
All figures magnified 1375 diameters. 
FiG. 39. S. ¢rifoliatum. Two antipodal cells; indications of direct nuclear 
divisions. ip 
Fig. 40. S. daciniatum. Three antipodal cells, the inner one with two 
nuclei. 
Fic. 41. S. integrifolium. Three antipodal cells, with a total of five 
nuclei. Be 
Fic. 42. S. integrifolium. Seven antipodal cells, with a total of eight 
nuclei ; ndications of amitotic division. é 
FiG. 43. S. integrifolium. Micropylar portion of embryo sac, showing 4 
nucellar cap (ca) whose cells have continued growth. 
Fic. 44. S. integrifolium. Egg apparatus with nucellar cap, the latter 
showing remains of cell walls and nuclei. 
FIG. 45. S. perfoliatum. Mature embryo sac, showing, especially, the 
long pear-shaped synergidae. (Iron-alum-haematoxylin.) 
Figs. 46-49. S. ¢rifoliatum. Portions of transverse sections of young 
anthers, showing stages in the development of the sporogenous cells and their 
surrounding layers from the hypodermal archesporium; at 4, Sig. 49 ins 
endothecium and middle layer are seen to have a common origin. — (Fuchsin- 
iodine-green.) 
. PLATE VII 8 
Figs. 50-58, magnified 1375 diameters ; figs. 59-637, magnified 2400 diameter 
Pee : : i of 
FiG. 50. S. trifoliatum. Transverse section of older anther; age 
r nucie!; 
Fig, 54. S. integrifolium. Two pollen mother-cells with spindle : 
first division, one seen from the side, the other from the end; eight ae 
Somes; tapetal cells, with two nuclei, lying next to the endothecium 
middle layer. (Saf.-gen.-violet.) 
