1903] GAMETOPAYTES AND EMBRYO OF TAXODIUM 137 
PLATE IV. 
Fic. 45. Megaspore before first division; distinct zone of large cells 
around it. X 400. 
Fig. 46. Two cells of the large-celled tissue in division. Xx 800, 
Fic. 47. Germinating megaspore in middle of large-celled tissue; April 
29, 1900. X 70. 
Fig. 48. Enlarged section of the above-mentioned tissue. x 400. 
FIG. 49. Longitudinal section of entire ovule five weeks after pollination, 
6 
Fig, 50. Ovule showing two prothallia. X 70. 
Fig. 51. Longitudinal section showing nucleated cytoplasm of wall layer 
of megaspore, large-celled tissue, and nucellus cells. X 400 
IG. 52. Large-celled layer around somewhat older prothallium. X 280. 
FiG.53. The same; after-formation of prothallial cells, x 280. 
Fig. 54. Young stage, ingrowing cells of prothallium. x 280. 
PLATE V, 
Fic. 55. Prothallial tubes, after closure of inner ends. X 280, 
FIG. 56. Two-celled stage of the same. X 280. 
Fic. 57. Tip of young prothallium showing group of archegonium initial 
cells. X 70, 
Fig. 58. Prothallial cell becoming multinucleate. x 400. 
FIG. 59. The same with five nuclei. 400. ; 
Fic, 60, Formation of neck cells in archegonia. x 280. 
Fig. 61. Older archegonium ; neck cell divided. x 280. 
Fig. 62. Still older archegonium ; kinoplasmic areas beginning to appear. 
X 280. 
F1G, 63. Nucleus of central cell of archegonium at same age as above. 
X 400. 
Fic. 64. Group of archegonia showing ten in one section, two pollen 
tubes above; somewhat diagrammatic. X 70. 
Fig. 65. Cross-section of group of archegonia, showing seventeen. X 85. 
PLATE V1, 
1G. 66. Archegonium showing kinoplasmic masses in central cell; after 
entrance of plastic stuff from neck cells. x 280. 
Figs. 67-69. Jacket cells in normal activity. x 800. 
FG. 70. Spindle in jacket cell at time of fertilization. x 800. 
Fics. 71-74. Stages of disintegration of nuclei of jacket cells. x 800. 
IG. 75. Lower part of archegonium at time of fertilization showing pro- 
teid vacuoles. x 800. 
Figs. 76-82. Successive stages in division of central cell of archegonium ; 
Jig. 76. X 400; figs. 77-82. X 800. 
