Generations , and General Cytology of the Uredineae . 371 
Fig. 25 a. Polar view of chromosomes on spindle, x 1900. 
Fig. 26. Anaphase showing chromosomes separating into two groups, x 1900. 
Fig. 27. Similar stage to above, but each group forms apparently a chromatin network, x 1900. 
Fig. 28. Anaphase showing two groups of chromosomes moving towards each pole. x 1900. 
Fig. 29. Later stage, showing chromosomes continuous from pole to pole and partially fused, 
x 1900. 
Fig. 30. Later stage, showing two distinct chromatin masses continuous from pole to pole. 
X 1900. 
Fig. 31. Chromatin forms an irregular mass at each pole with remains of elongated spindle 
between them ; the radiations from the upper centrosome were about twice as long as shown and 
extended to the free end of the germ-tube. x 1 900. 
Fig. 32. Similar stage to above, but two distinct chromatin masses at one pole. x 1900. 
Fig- 33 - Daughter -nuclei formed ; each shows kinoplasmic material (remains of spindle) and 
a centrosome with radiations, x 1050. 
Fig. 34. First stage of second division; nucleus irregular and shows two centrosomes. x 1900. 
Fig. 34 a. Early stage of second division in promycelium, showing spindle in young state, lying 
on one side of nucleus, x 1900. 
Fig. 35. Later stage, in which spindle is now arranged axially in the tube and is partly sur- 
rounded by the chromatin mass, x 1900. 
PLATE XXII. 
Figs. 36-45. G. clavariatforme. 
Fig. 36. End of promycelial tube, showing second division with spindle now lying in the centre 
of the chromatin mass, x 1900. 
Fig- 37. Section through spindle, showing chromatin in the form of granules, x 1900. 
Fig. 38. Tube showing the two nuclei in different stages of division. At a the chromatin forms 
a distinct network and covers three-fourths of the spindle ; at b a later stage is visible, in which the 
spindle is completely hidden by the elongated chromatin network, and only the centrosomes with 
their radiations are to be seen, x 1900. 
Fig* 39* The two main portions of the chromatin network have drawn apart towards the poles, 
but are still connected by a number of threads, x 1900. 
Fig. 40. Chromatin portions completely separated at the poles; the projecting arms are the 
remains of the threads which connected the portions in an earlier stage, as in Fig. 39. x 1900. 
Fig. 41. A somewhat later stage than above ; the projecting arms have been drawn in, and the 
chromatin forms a single mass at each pole. 
Fig. 41 a. A similar stage to above, but chromatin forms two distinct masses at one pole, 
x 1900. 
Fig. 42. Almost complete germ-tube (promycelium), showing the nuclei just formed, and 
a transverse wall in middle. In three of the nuclei the centrosome and the small portion of 
kinoplasm which connects it with the nucleus are clearly visible, x 1900. 
Fig. 43. The four cells of the promycelium are formed. Three of the nuclei show a chromatin 
network, the other is in a younger state and still remains almost homogeneous, x 1350. 
Fig. 44. Promycelium with outgrowths from each cell. The outgrowths are of the nature of 
germ-tubes rather than of sterigmata, x 880. 
Fig. 45. Sporidium. x 1350. 
Fig. 46. Portion of spermogonium of Phrag. violaceum on leaf of Rubus, showing general 
characters and thickened ruptured cuticle, x 660. 
Fig. 47. Group of spermatia of same, x 1900. 
Figs. 48-59. G. clavariaeforme. 
Fig. 48. Section through spermogonium on leaf of Crataegus. The spermatial hyphae, 
spermatia, paraphyses, basal tissue (plectenchyme), and host tissue are all clearly visible, x 520. 
Fig. 49-54* Stages in the development of a spermatium on a spermatial hypha. x 1350. 
Fig- 55* Dividing nucleus of spermatial hypha, showing chromatin collected into a solid mass, 
x 1900. 
Fig. 55 Stage showing nucleolus being expelled as chromatin shrinks to a homogeneous 
mass, x 1900. 
