oe = attip. xX 150. P. coriacea. 
106 BOTANICAL GAZETTE [F 
Fig. 5. Pollen grain soon after third division ; starch still presen Xm 
Fic. 6. Oblique spindle of third division. x 750. 
Fig. 7. Pollen grain soon after the amitotic division of the <7 r 
thallial nucleus. x 1550. 
Fic. 8. Five nuclei in pollen grain, two of which have arisen from te 
amitotic eae of the second prothallial nucleus. X 750. 
FIG ollen grain with six nuclei; the first prothallial << 
also rene oem 750. 
Fi. to. Pollen grain with five nuclei, all of which are lying free 
general cytoplasm: the generative nucleus is frie here, as 4 
with a special protoplasmic sheath. x 750. 
Fig. 11. Section of wall of microsporangium just before the first divis 
of the pollen grain. x 315. a 
Fig. 12. Body cell and stalk nucleus, after the pollen tube has a0 
the prothallium. x 315. ae 
Figs. 13-16. Sections through the same 3 ost tube, showing functio 
male cell, degenerating male nucleus, and three small nuclei ; figs. | 
and 75 are consecutive. X 315. 
Fig. 17. Diagram showing pollen tube from which the above <i 
" Mere made; other pollen tubes and a fertilized archegonium are - 
X 30. | 
_ Fig. 18. Four-celled female prothallium with two disonganizing 
| ‘Fie. Tg. Diagram of two mature prothallia in the same nuclets; 
cross indicates the position of the tracheids. x 4%. P. cortaced. 
Fi. 20, Tracheids found in one of the prothallia repr 
‘above diagram; they are surrounded by multinucleate cells | : 
a x IT ase P. coriacea. 
PLATE VI. 
: Fre. 21. ibtien longitudinal section of cothaiiiars E from cent 
. showing small cells of the axial rows, and a single oe 
‘epidevila Wee surface cells. x 30. 
Fig. 22. Young archegonium ; neck cell shows a cross. division 
P. coriacea, : 
“Fics. 23-26. Neck cells of mature archegonia, showing eat 
x iso. 
Fig. 27. Disera of tip of ovule; archegonia mature. * 
Fic. 28. Eee pe nucleus and ventral canal nucleus in mane 
an 50. 
G. 29. Egg nucleus and ventral canal nucleus in contact. 
