TELIA 



325 



Telia. Teliospores arise from mycelium, originating ( 1 ) from 

 aeciospores, (2) from urediniospores, or (3) from sporidia. They 



c a^ 



Fig. 125. A. Vertical section of uredinial pustule of Coleosporhim soUdagi- 

 nis. The ''buffer" peridial cells are lacking. Intercalar\^ cells separate the 

 urediniospores that are produced in chains. The basal cells give rise in 

 acropetal succession to urediniospores and buffer cells alternately. 

 (Adapted from xMoss.) B. Portion of mature uredinium of Melampsora 

 lini. The capitate structure at the left is a paraphysis. The urediniospore 

 at the right is long-stalked. The remaining stalks exhibit stages in ure- 

 diniospore delimitation. (Adapted from Fromme.) C. Section of young 

 uredinial pustule of Melampsorella elatma. Buffer cells constitute a layer 

 immediately beneath the epidermis. Beneath them are immature uredinio- 

 spores. Clear binucleate cells beneath the urediniospores separate them 

 from the basal urediniospore-mother cells. (Adapted from Moss.) 



are rv^picallv thick-walled resting spores that normally have a 

 period of dormancy, but in lepto forms teliospores are capable of 

 germination as soon as they reach maturity. The arrangement 



