392 



CLASS BASIDIOMYCETEAE 



B 





Fig. 130. Subclass Teliosporeae, Order Uredinales. Origin of chains of aeciospores 

 from union of basal cells in the aecium; Cronartium rihicola Fischer. (A) Basal cell of 

 future aeciospore chain. (B) Chain of aeciospores and intercalary cells. (C-G) Steps 

 in the formation of a chain of aeciospores and intercalary cells in Phragmidium specio- 

 sum (Fr.) Cke. (A-B, courtesy, Colley: /. Agr. Research, 15(12) :619-660. C-G, 

 courtesy, Christman: Botan. Gaz., 39(4):267-275, Univ. Chicago Press.) 



