FROMME: SEXUAL FUSIONS IN FLAX RUST 131 
F A quadruple cell fusion. The “fusion cell’’ is stained so heavily 
that the nuclei are not distinguishable. x I,000 
Fic. 24. Another quadruple cell fusion. X 1,00 
Fic. 25. A e spore mother cell, of the 2eciium, containing eleven nuclei. 
A cell wall is being formed near the center of the cell. XX 1,000. 
FIG cell containing eight paired age masses indicating that a 
simultaneous deus of four nuclei is just being completed. X 1,500 
Fic. 2 A four-nucleated aecidiospore and intercalary cell. 
Fic on Migration of a nucleus through the walls of two adjoining vegetative 
cells which lie below the fertile layer of an old aecidium 
[The nucleus is not as distinct in the plate as in he original drawing, and the 
cisposition of cytoplasm has been somewhat changed in the reproduction of the 
figure on the p 
Fic. 209. . es of two nuclei from two vegetative cells into a third vegeta- 
tive cell. XX 1,500. 
Fic. 30. A portion of an uredosorus. The binucleated ea oad are borne 
on long stalks made up of two or three binucleated cells which arise from binucleated 
mycelium. Sterile, capitate paraphyses are shown at the outer Guan of the group. 
The knoblike apical cell is somewhat irregular in outline and the stalk is non-septate 
and very slender. The young paraphyse on the right is binucleated and contains 
t of cytoplasm while the older one on the left has lost its contents. 
(Slightly diagrammatic.) 
Fic. 31. A portion of a teleutosorus showing the appressed layer of one-celled 
teleutospores, the tips of which are imbedded in a waxy substance. The spore on 
the right is binucleated while the others have become uninucleated through a fusion 
of the primary nuclei. x 750. 
