56 BOTANICAL GAZETTE [JANUARY 
Fic. 43.—Unequal division; ventral canal nucleus larger than e 
Fic. 44.—Elongated venter almost equally divided; ventral canal nucleus 
same size as egg 
1G. 45.—Venter with 4 cells; the 3 lowest probably are eggs, the upper- 
most the ventral canal cell. 
Fic. 46.—Median longitudinal section through cap of mature archegonium, 
showing unusual divisions. 
Fic. 47.—Section tangential to face of leaf; first stage in the development 
of mucilage hair; axillary cell at base of leaf becomes papillate. 
Fic. 48.—Nucleus has divided and papillate cell cut off by a wall. 
Fic. 49.—Acropetal division of the papillate cell. 
Fic. 50.—Second acropetal division of the papillate cell; the mature 
mucilage hai 
Fic. 51 phage? form of mucilage hair. 
PLATE VII 
Fic. 52.—Series of transverse sections through young primary archegonium 
and two secondary. 
1G. 53.—Serial sections through archegonium proper, showing cover 
cell and central ce 
Fic. 54. <cSeetal sections; the cover cell has divided, but central cell is 
yet undivided. 
Fic. 55.—Serial sections, showing in the formation of the archegonium 
proper the three oblique walls Sai have cut off the peripheral segments and 
originated the primary axial cell w 
Fic. 56.—Serial sections hear archegonium having primary neck 
canal cell and primary ventral cell; the cover cell has formed a quadrant of 
Fic. 57.—Serial sections through archegonium with 6 canal cells and 
ventral cell; the cover contains 8 cells; the gradual transition from cap to 
neck to venter is well shown. 
Fic. 58.—Serial sections through simplest portion of neck of mature mas- 
sive type of archegonium; section A shows the characteristic thickenings 
toward the cap. 
Fic. 59.—Venter of same series at level of egg nucleus. 
