Teleiitospores. 45 



be typical of the species in question. There are instances, 

 however, in which, instead of being truly typical, these 

 uredospores depart in some degree from those subsequently 

 found in the life-history of the Uredine. For example, in 

 TriphragDiiuni tibnaricE the primary uredospores do not 

 differ in their individual form and size from the secondary, 

 but the former occur in large dusty sori principally on the 

 petioles and midribs of the host-plant, while the latter are 

 much smaller and scattered over the under-surface of the 

 leaves. A more common deviation, however, consists in 

 the association of the primary uredospores with spermo- 

 gonia (Brachypuccinia). 



4. In other instances the mycelium produces spermo- 

 gonia and aecidiospores. The secidiospores may be upon 

 the same species of host-plant upon which the teleuto- 

 spores occur (Auteupuccinia), or upon some plant of a 

 totally diverse nature (Heteropuccinia) 



The teleutospores of Endophyllum, although they are 

 produced in the same way and closely resemble aecidio- 

 spores, yet in germination they behave like the teleutospores 

 of Puccinia (Plate IV. Fig. 7). In Coleosporium (Plate IV. 

 Fig. 9) each cell produces a single promycelial spore, 

 while in Melampsora (Plate IV. Fig. 8) and Chrysomyxa 

 (Plate IV. Fig. 10) three or four are developed from each 

 promycelium, as is also the case with Cronartium. 



