96 BOTANICAL GAZETTE [ave 
Fic. ro. A group of selected tetrads, showing rings, crosses, Ys, and Ts; 
tetrad resolved into its elements 
Fic. 11. Neighboring tetrads of an equatorial plate; in one the — 
character is clear, while in the other it is obscured. y 
Fic. 12. Prophase of first division; nucleus many-lobed; fibers over ie i 
largest lobe and at other places on the altars of the nucleus. 
Fic. 13. Spindle organizing for first division; spindle fibers piominels 0 q 
one end, approaching bipolar condition. 2 | 
Fic. 14. Bipolar spindle of first division; nuclear membrane resolving in q 
“ar fibers. 
15. Oblique side view, metaphase of first division; end of 
2 
Fic. 16. Metaphase of first division, showing one very flat and one forked pol 
Fic. 17. Dividing chromosomes. 
Fic. 18. Anaphase of first division, showing chromosomes scattered. 
Fic. 19. Telophase of first division, showing grouping of chromosomes ; 
rings at the poles. 
Fic. 20. Beginning of reconstruction of daughter nuclei at completion of 
division; the a do not lose their identity and no nuclear membrane 
is formed. : 
Fic. 21. Metaphase of second division, showing side view of one spindle 
polar view of the other; in the side view the poles are seen to be pointed 4 
the polar view eight chromosomes appear. 
Fic. 22. Anaphase of second division, showing blunt poles. 
Fic. 23. Telophase of second division, showing nine chromosomes in the 
view of one of the spindles. 
Fic. 24. Telophase of second division, showing beginning of cell plate 
spindle and transverse section of fibers in the other. 
Fic. 25. Formation of cell plate. 
Fic. 26. Completed spores with resting nuclei and separating wall 
. Fic. 27. A single spore which has increased in size and has at 
toed and roughened wall. 
Fic. 28. Resting nucleus of elater. 
Fic. 29. Segmenting spirem of cell from seta of sporophytes ie 
chromosomes 
FI. 30. Bisaiotes of the same cell, showing seven additional ch 
making sixteen in all; chromosomes differ in shape from those of ° 
spore mother cell. 
Fic. 31. Early telophase of cell from seta; only half of the cell 
there are eight chromosomes at one end and seven at the other; the né¢ 
section makes it evident that the total number is sixteen at each en 
