1906] SHREVE—SARRACENIA PURPUREA 125 
Fic. 28. Growing point of tip of carpel in umbrella, horizontal section. > 4o. 
Fie. ste Stylar umbrella viewed from above; in outline. x 4. 
Fic. 30. Ovary and style to show the course of pollen tube indicated by 
dotted om somewhat diagrammatic. x2 
Fic. 31. Longitudinal section of stigma surface with sprouting pollen 
grains, X 120. 
Fic. 32. Longitudinal section of conducting strand in umbrella of style 
eo conducting and vascular tissue. X 40. 
33- Transverse section of upper surface of umbrella of style showing 
ncaa. and vascular tissue and glandular epidermis. X 120. 
1G. 34. Transverse section of stalk of style before pollination. X 20. 
Fic. 35. Transverse section of stalk of style at time of pollination. X20. 
Fic. 36. Tip of pollen tube from conducting tissue of umbrella; optical 
section. X 400. 
Fic. 37. Cross wall in tube near stigmatic surface. X 400. 
PLATE V. 
Fic. 38. Longitudinal section of upper end of embryo sac showing fusion 
of male and female nuclei. 400. 
Fic. 39. Longitudinal section of embryo sac showing two-celled endosperm, 
columnar tissue, and remains of nucellus. x 120. 
Fic. 40. Longitudinal section of embryo sac showing four-celled endosperm. 
X 120, 
Fic. 41. Longitudinal section of portion of ovule showing eight-celled endo- 
ages Sere integument. X 40. 
G. 42. Longitudinal section of seed through the wing showing multicel- 
lular pa oe and two-celled embryo. X20. 
Fic. 43. Two-celled embryo. X 232. 
Fic. 44. Young embryo with suspensor. % 400. 
Fic. 45. Older embryo with suspensor. 232. 
Fic. 46. Longitudinal section of embryo from mature’ seed. X 120 
Fic. 47. Tranverse section of men seed cutting the embryo through the 
cotyledons; detail partially filled in. X4o. 
Fic. 48. Longitudinal section aie the hilum of nearly mature seed. 
Fic. 49. Longitudinal section of germinating seed, with cotyledons; hee 
Coat has been removed; portion beyond the dotted line is that from which 
aleurone has not yet been removed. X20 
Fic. 50. Seedling with cotyledons a three aacoasmnoede pate p eee 
Fic. 51. Vertical section through growing-point of seedling. 
FIG. 52. Median vertical section through primordium of oa pare 
donary = X 232. 
Fic. 53. Median vertical section through portion of primordium of first epi- 
cotyledonary leaf in later stage of development. X 232. 
