UREDINALES 



573 



tinguish them. The initial cells change entirely into teliospores instead 

 of dividing into spores and intercalary cells. They remain connected 

 with one another and, by the increase of new cells on the lower side, 

 form a lengthening column which finally ruptures the peridium and 

 passes out through the epidermis (Fig. 384, 1). The teliospores are 

 thin-walled, apically thickened and capable of immediate germination 

 at maturity (Fig. 384, 2 to 7). 



Fig. 384. — Cronaritium ribicola. Short column of teliospores with teliospores already 

 germinated in the upper portion. 2. Mature teliospore. 3. Beginning of germination. 

 4. Basidium. 5. Tip of basidium with basidiospore. 6, 7. Germination of basidispores. 

 (1 X 115; 2 to 7 X 565; after Colley, 1918.) 



The telia of Chrysomyxa (Fig. 385) are similar in their structure but 

 lack the peridium; in Chrysomyxa Abietis, however, the development of 

 the teliospores is somewhat more complicated. Each of the fusion cells, 

 which here, as in Uromyces scutellatus and Gallowaya pinicola, result 

 from the fusion of two palisade cells, elongates much and divides into 

 an apical "sporoid cell," which subsequently swells and thickens its wall, 

 and into a basal cell, which remains slender and thin walled. The sporoid 

 cell may divide by septa into two or three chambers and winter over in 

 this condition. In spring each chamber forms a projection, into which 



