Teleutosporcs. 



In the American species P. ajuorphcs, Curtis, the mother- 

 cell remains distinct from the spore-wall of the teleutospore, 

 separated by a gelatinous substance. When the teleuto- 

 sporcs of this species are placed in water the mother-cell 

 swells in a very remarkable manner, and can be seen 

 surrounding the teleutospore (Plate IV. Figs. 15, 16, 17). 

 The germinal canal penetrates the membrane only, being 

 closed below by the endospore. The germinal canal 

 of the lower spore is placed laterally immediately below 

 the septum. In most species the exterior of the spore is 

 smooth, but in several it is tuberculate, papillose, or verru- 

 cose. In one of the American species, P. aaileata, these 

 protuberances are nearly cylindrical and curved. In P. 

 fiisca, pnmi, etc., the tubercles are small, but exceedingly 

 numerous, covering the whole exterior of the spore. In 

 P. sinyniii they are few, discrete, and conical. P. coronata 

 is characterized by a crown of elongated, variously bent, 

 cylindrical processes, surmounting the upper segment. 

 Here the superior germ canal is not situated at the apex 

 of the spore, but towards one side (Plate IV. Fig. 3), just 

 as it normally occurs in the lower cell of other species. 

 The general outline of the Puccinia spore varies not only 

 in different species, but also in individual spores from the 

 same spore-bed. In P. primi and ftisca the teleutosporcs 

 consist of two distinct superimposed globose bodies, 

 flattened at the point of contact ; these easily separate 

 from one another by rough manipulation. Not infre- 

 quently, only one segment of the spore becomes de- 

 veloped, the other, usually the lower, remaining abortive. 

 In some instances numerous single spores (mesospores) 

 are produced, either mixed with the normal bicellular 

 spores or without them, as in P. obscura, scirpi, convolvuli, 

 porri, and sonchi. These mesospores are morphologically 

 analogous to the teleutosporcs of Uromyces. /-*. riibigo-vera, 



