130 BOTANICAL GAZETTE [FEBRUARY 
Fic. 30. Binucleate cell from gametophyte; one nucleus apparently under- 
going absorption; July 19, 1905. 325. 
Fic. 31. Multinucleate cell from prothallial tissue; July 28, 1905. 325. 
Fic. 32. Open inner cell showing centripetal growth by means of spindles; 
extra fibers being attached to outer nucleus; July 19, 1905 325 
Fic. 33. Curious incomplete double spindle from open inner cell; July 19, 
1905. 325. 
Fic. 34. Vertical section of ovule, showing — sac filled with tissue; 
the closure appearing as a line; August 21, 1905. 
Fic. 35. Transverse section of ovule, showing i sac filled eens tissue; 
showing radiation of cell rows from line of closure; August 21 
Fic. 36. Vertical section of tissue at line of closure, rite eae 
end walls of opposite cells; August 21, 1905. X325. 
Fic. 37. Diagram of vertical section of prothallium, showing amount of 
tissue present at time when archegonia are becoming conspicuous; July 19, 
1905. X2. 
Fic. 38. Typical mature cell from gametophyte, showing single nucleus and 
abundance of starch; August 21, 1905. X 325. 
Fic. 39. Vertical section through spongy mass, showing mode of increase 
in size, and effect upon surrounding cells; May 1, 1905 X 325. 
Fic. 40. Diagram of vertical section of ovule, showing differentiation of tis- 
sues in the integument; June 10, 1905. X4. 
a 
