OBSERVATIONS ON PUCCINIA MIRABILISSIMA. 135 
enumerates the various facts leading to this view with great 
clearness and also intimates that germination experiments 
might add still more evidence. My experience seems to 
show that this is not the case. The only additional argu- 
ment I would here advance is derived from the abundance of 
three- and four-celled spore forms for I think that it must be 
admitted that the presence of such a large number of these 
peculiar spore-formations shows an inherent tendency on the 
part of this fungus to assume characteristics peculiar to the 
genus Phragmidium. 
EXPLANATION OF PLATE. 
Fig. 1. Uredospores in different stages of maturity, show 
ing also their articulation with the pedicel. 
Fig. 2. Teleutospores distended with caustic potash and 
showing the position of the germ-pores. 
Fig. 3. Some of the peculiar three- and four-celled 
teleutospore formations. 
Fig. 4. Germination of the uredospores. 
Fig. 5. Germination of the teleutospores. 
Fig. 6. Promycelia from the teleutospores developing 
promycelial-spores. 
