54 BOTANICAL GAZETTE [JANUARY 
EXPLANATION OF PLATES IV-VII 
All figures were drawn with aid of Abbé camera lucida at table level, and, 
being reduced one-half in reproduction, now show the following pong 
figs. 1-35, 43-56, X525; figs. 36-42, 57, X300; figs. 58-59, X18 
Abbreviations are as follows: a, primary archegonium or its ideal be, 
secondary archegonia or their initials; /, leaf. 
PLATE IV 
Fic. 1.—Primordium showing a primary initial and one secondary initial. 
1G. 2.—Tangential section through primordium, showing primary initial 
and two seconda 
IG. pines. in transverse section; dotted line shows plane of cut in 
Fic. 4.—First wall in primary initial slanting; secondary initial has 
divided to form an inner and an outer cell. 
IG. 5.—First wall in archegonium initial slanting, second transverse; 
no secondary formed. 
Fic. 6.—First wall of primary initial transverse. 
IG. 7.—Uppermost wall of primary initial transverse; next below tilts 
slightly; secondary not shown. 
Fic. 8.—Two transverse walls in primary archegonium; secondary shows 
first transverse wa 
Fic. 9.—Three pps ok stories of primary archegonium formed by 
cantee walls. 
IG. 10.—Walls of primary archegonium do not quite intersect. | 
1G. 11.—Development of the primary archegonium by an apical cell 
with two cutting faces; first transverse wall has appeared in the secondary 
archegonium. 
IG. 12.—The same, slightly older. 
Fic. 13.—Stalk of archegonium formed chiefly by walls that do not inter- 
sect; in terminal story the primary axial cell has been originated by the three 
oblique walls. 
Fic. 14.—Stalk of primary archegonium regular; primary axial cell cut 
out; median longitudinal section through secondary archegonium showing 
two transverse w 
Fic. 15. — Tangential section through secondary archegonium showing 
two transverse w 
Fic. 1 ee consisting of primary archegoniamn and two secondary; 
the primary and one secondary shown in ou 
Fic. 17.—Division of primary axial cell see cover cell and central cell. 
Fic. 18.—Cover = and central cell. 
Fic. 19.—The sam 
Fic. 20.— Division ~ central cell into primary neck canal cell and primary 
ventral cell. 
