[24 BOTANICAL GAZETTE [FEBRUARY 
EXPLANATION OF PLATES V AND VI, 
The figures were all made with an Abbé camera. The lenses used were 
Bausch and Lomb 1 and 2-inch oculars and } objective, and Leitz. 4 oil 
immersion. The plates have been reduced one-half in reproduction, the 
magnification before reduction being 930, except for figs. 45-47. 
IGS, I-10, Archegonium initial and pedicel segments. 
Fic. 1. Papilliform archegonium initial rising above the surface of the 
receptacle. 
Fic. 2. After first division, showing first wall oblique. 
Fic. 3. Second wall laid down, forming the two-sided apical cell (xX). 
Figs. 4-7. Successive stages in ditomic segmentation up to the introduc- 
tion of the eighth wall; segment cells (s) dividing. 
Fries. 8-9. Lateral views of the archegonium initials represented in figs. 
2and g. 
Fic. 10. Lateral view of a young archegonium after vertical radial 
division of the pedicel segments, cf fig. 49, 
Figs. 11-22. Showing origin of archegonium mother-cell and other mem- 
bers of the axial row. 
Fic. 11. Young archegonium showing first peripheral cell (7) cut trom 
archegonium mother-cell (7); this division is the first character clearly dis- 
tinguishing the young archegonium from the young antheridium. 
IG. 12, Young archegonium farther ad ; the archegonium mother- 
cell (vw) has divided, giving rise to the terminal cell (¢) and the inner cell (2). 
1G. 13. Young archegonium, lateral view; inner cell (¢) and second 
peripheral cell (+) cut off. 
Fic. 14. Young archegonium; prophase of mitosis in inner cell (2). 
Fic. 15. Young archegonium; metaphase of mitosis in both the periph- 
eral (7) and inner cells (7). 
Fic. 16, Young archegonium; metaphase of mitosis in inner cell (2). 
Fic. 17. Young archegonium showing primary canal cell (#) and central 
cell (c) resulting from division of the inner cell. 
1G. 18, Young archegonium: same stage as that shown in fg. /?- 
FiG. 19. Young archegonium; same stage as that shown in fig 77: but 
with pedicel farther developed. 
FIG. 20. Young archegonium showing mitosis in terminal cell preparatory 
to cutting off the second canal cell: this feature distinguishes the moss 
archegonium from all others. 
1G, 21. Young archegonium showing transverse division in a peripheral 
cell; the section in this region is tangential, not diametral. 
FiG. 22. Young archegonium showing increase in size of central cell and 
progressive work of terminal cell, 
1G. 23. Tangential segment from young archegonium; each peripheral 
cell has divided once; a second division has occurred in most of resulting 
cells; torsion of neck probably due to this arrangement of groups. 
