Generations , and General Cytology of the Uredineae . 373 
Fig. 85. Portion of leaf of Rubus , showing young teleutospore-sorus and mycelium ; teleutospores 
in various stages and a few paraphyses are to be seen. Two basal cells of the teleutospores are 
marked x , and two binucleate haustoria marked *. x 500. 
Fig. 86. Three-celled teleutospore with stalk, in very young state, x 1350. 
Fig. 86 a. Slightly older stage than above ; the lowest cell is dividing and separating the fourth 
cell from the stalk. The wall shows the beginning of the characteristic thickening; the second 
nucleus in each of the two upper cells has been cut away, x 1350. 
Fig. 86 b. Uppermost cell of young teleutospore, showing the apical projection only partially 
obliterated by thickening, x 800. 
Fig. 86 c. Base of stalk of mature teleutospore, showing its attachment to the basal cell. x 1050. 
Fig. 87 a-c . Stages in the fusion of the two nuclei in the teleutospore. a the nuclei in contact 
but not yet fused ; b the nuclei have fused but not the nucleoli ; c the two nucleoli have fused. 
X 1900. 
PLATE XXIV. 
Fig. 88 a , b. Further stages in the development of the teleutospore nucleus of Phrag. violaceum. 
a a very distinct twisted chromatin thread in the nucleus ; b nucleus larger and returning to the 
condition of a simple network, x 1900. 
Figs. 89-93. G, clavariaeforme . 
Fig. 89. Two basal cells showing the development of the outgrowths which give origin to the 
stalked teleutospores. On the right the basal cell has just put out a second outgrowth, the first 
having developed into a teleutospore of which only the lower part of the stalk is seen, x 1050. 
Fig. 90. Young outgrowth from basal cell, not yet divided, x 1050. 
Fig. 91 a, b, c. Stages in the fusion of the nuclei in the teleutospore. At a the nuclei in contact 
but not yet fused ; at b the two nuclei partly fused ; at c the nuclei fused, but not the nucleoli, x 1350. 
Fig. 93. A later stage than above, in which the two nucleoli have fused to a single nucleolus 
and the chromatin is in the form of a single twisted thread, x 1050. 
Fig. 93 a-e. Stages of division of paired nuclei from the young dividing teleutospore of Phrag . . 
violaceum . x 1900. 
Fig. 94. Dividing cell of teleutospore in which each nucleus shows two chromatin masses, 
x 1900. 
Fig. 95 a-d. Stages of ‘conjugate division’ from the uredospore-mother-cell of Phrag. 
violaceum. x 1900. 
Fig. 96. Similar stage to that of 95 b , but the chromatin of each nucleus forms two masses, 
x 1900. 
Fig. 97. Uredospore-mother-cell of Phrag. violaceum dividing ; each of the daughter-nuclei 
shows two chromatin masses, x 1900. 
Fig. 98. Conjugate nuclear division, showing four chromatin masses, from developing teleuto- 
spore of G. clavariaeforme. X 1900. 
Fig. 98 a. First stage of division ; the nuclear membrane has disappeared and the chromatin 
become condensed : from teleutospore as above, x 1900. 
Fig. 99. Haustorium, showing two nuclei, from uredospore-bearing mycelium of Phrag. 
violaceum. x 1050. 
Fig. 100. Nuclear division in one of the four promycelial cells of G. clavariaeforme. A distinct 
spindle is visible but no centrosomes; the arrangement of the chromatin is not clear, x 1900. 
D d % 
