1915] BRYAN—ARCHEGONIUM OF SPHAGNUM SUBSECUNDUM 55 
Fic. 21.—The same, but shows cover cell divided. 
Fic. 22.—Primary neck canal cell and primary ventral cell formed; cover 
cell has divided into two almost equal segments; plastids beginning to be con- 
spicuous about each nucleus. 
IG. 23.—The same, but cover is forming a quadrant; the cell on the 
left shows a figure, while that on the right has divided in the same plane. 
PLATE V 
Fic. 24.—Primary neck canal cell and primary ventral cell; unequal 
growth in the walls pushing cover to one side. 
Fic. 25.—Primary neck canal cell in division. 
Fic. 26.—Two neck canal cells and the primary ventral cell; intercalary 
growth in the walls of the archegonium, pushing cover to one side; plastids be- 
coming conspicuous. 
Fic. 27.—Slender type of archegonium with two neck canal cells and the 
primary ventral cell; the uppermost neck canal cell is in division. 
Fic. 28 --Sinmultancous division of the two neck canal cells. 
Fic. 29.—Three neck canal cells and primary ventral cell; cover has 
6 cells (three shown in median longitudinal section). 
Fic. 30.—Slender type of archegonium with three neck canal cells and 
primary ventral cell; figure in terminal neck canal cell; cover as above. 
Fic. 31.—Three neck canal cells and primary ventral cell with figure in 
basal neck canal cell; cover as above 
1G. 32.—Massive type of archeaonitin: four neck canal cells and primary 
ventral a cover as above. 
Fic. 33.—Five neck canal cells and primary ventral cell; cover, tilted to 
one side, A 8 cells (4 shown 
Fic. 34.—Five pred canal cells and primary ventral cell; the middle 
neck canal cell is in divi 
Fic. 35.—Six canal ae and primary ventral cell; thea a through 
dsturbane, has 8 cells; plastids conspicuous in the cana 
G. 36. ~Syminetrical type of archegonium, having ‘ oe canal cells 
and ag ventral cell; cover difficult to follow, but probably has 8 cells 
(4 shown). 
Fic. 37.—Seven neck canal cells and primary ventral cell. 
PLATE VI 
Fic. 38.—Eight neck canal cells and primary ventral cell. 
Fic. 39.—Seven neck canal cells and primary ventral cell in division to 
form rates canal cell and egg. 
oe 40.—Nine neck canal cells, ventral canal cell, and egg. 
41.—Neck canal cells broken down; protoplasm beginning to round 
off ie ventral canal nucleus and egg. 
Fic. 42.—Fine example of double venter. 
