508 BOTANICAL GAZETTE [JUNE 
Fic. 22 -—Detail from micropylar end of sac of age shown in preceding 
figure; 125. 
Fic. 23.—A slightly older gametophyte; X20 
Fic. 24.—A detail from preceding figure dhowins lack of walls and presence 
of free cells; X 250. 
Fic. 25.—A central part of the gametophyte in early March, showing the 
lack of walls; from the same slide as fig. 31; X125. 
Fic. 26.—Section through an ovule in which the nucellus is growing and 
the cavity enlarging, but in which there is no gametophyte; X 20. 
Fic. 27.—Section through an ovule without any gametophyte, but with 
its place occupied by an enlarging mass of cells probably derived from the 
spongy tissue; X 20. 
Fic. 28.—Early stage of the erosion of nucellus by the pollen tubes, July; 
note the abundant starch; X62. 
Fic. 29.—A nucellus ‘a December when most of the starch has disappeared 
and all the upper part of the nucellus has been destroyed by the tubes; X62. 
Fic. 30.—Section through an archegonial complex; note the remains of 
the apical cap of dead cells and the superficial neck; X85. 
Fic. 31.—Micropylar end of thallus about March 1, with archegonial 
initial; X125. 
Fic. 32.—Lateral portion of another thallus with young archegonium near 
top; X125. 
Fic. 33.—An archegonium initial just before division; X 250. 
Fic. 34.—Young archegonium just after cutting off primary neck cell; 
X 250. 
Fic. 35.—Apical end of an irregular thallus with young archegonia; 
Fic. 36.—Similar thallus with smooth outline and young archegonia; X62. 
Fic. 37.—Young archegonium; neck cell undivided; X 250. 
Fic. 38.—Similar archegonium with neck divided; X 250. 
Figs. 39, 40.—Enlarging archegonia; X 250. 
1G. 41.—Archegonium about one-half mature, showing neck, vacuolate 
cytoplasm, jacket, and position of nucleus; X 125 
Fic. 42.—Nearly mature archegonium with nucleus to one side and just 
below neck; 125. 
Fic. 43.—Mature sichegontiii, X125. 
Fic. 44.—Cross-section through a complex where there are no jacket cells 
between two of the archegonia; 125. 
Fic. 45.—Section showing dome-shaped neck and position of nucleus 
below it; 250. 
Fics. 46, 47.—Cross-sections through usual type of neck; X 250. 
Fics. 48-50.—Serial sections through neck with one very large cell; 125. 
Fic. 51.—Longitudinal section of 3-tiered neck; X 250. 
