184 Cook : EMBRYOLOGY OF RHYTIDOPHYLLUM 
Explanation of plate 10 
Fig Ig and 25 were drawn with Zeiss No. 2ocular and No. C objective and 
are slighty ik: All other figures were drawn with Zeiss No. 2 ocular and 
1/12 oil-immersion objecti 
ll figures drawn ce Rhytidophyllum crenulatum, except figures 2 and 25, 
which were drawn from 2. éomentosune. 
1G. Ia, Ovule with archesporial cell. 
Fic. 16. Ovule with functional megaspore. 
Fic. tc. Ovule with sac in four-nucleate stage. 
Fic, 12. Ovule with sac in eight-nucleate stage. 
Fic, 2. Same as Fig. 1 
Fic. 3. Two Seen 
Fic. 4. Same as Fi 
Fic, 5. Two- siiclente sa of embryo-sac. 
Fic, 6, Four-nucleate stage of embryo-sac. Same as Fig. Ic. 
Fic. 7. Eight-nucleate stage of embryo-sac showing egg-apparatus and one 
polar nucleus. 
and 9. The. antipodal nuclei. 
Fic. 10. The union of the polar nuclei. 
Fic. 11. Embryo-sac showing egg, pollen-tube and endosperm nucleus. 
Fic, 12. Embryo-sac showing fertilized egg, pollen-tube and two daughter-nuclei 
formed by the first division of the endosperm-cell. 
Fic, 13. ughter-nuclei formed by the first division of the endosperm-nucleus 
and es oe a wall, 
ndosperm in the antipodal end of the sa 
ine 7. Much older and showing the large ire cell. 
Fic. 16. Nucellus and integuments. Slightly older than Fig. 23. 
Fic. 17. Young embryo showing early divisions. ° 
Fic. 18. Young embryo showing later Sita and haustorial oe of 
the suspensor 
‘IG. 19. Remains of fieiaebiiet suspensor. Bains age as Fig. 
Fic, 20-22. Spherical embryo showing dermatogen, a. Speiiblew, and 
basal cells. 
1G, 23, a@and 6. Embryos showing origin of ie derecncoee and the basal cells. 
Fic. 24. Abnormal embryo 
Fic. 25. Embryo, two Layer of nucellar cells and integuments. 
