312 



[Vol. 6 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Teleutospores. Sori hypophyllous, dark reddish brown, scat- 

 tered over the whole surface or confluent in excessive crusts, 

 covered by the epidermis; spores prismatic, rounded at both 



Fig. 3. Melampsora Larici-U rbaniina . Teleutospores. Camera 

 lucida drawing X4G0. 



ends, 38-70X9-15 m; membrane somewhat brown, uniformly 

 thin, without an evident germ pore; contents orange-red; 

 sporidia spherical, 9-15 p. 



Caeomata on Larix decidua; uredo- and teleutospores on 

 Salix Urbaniana. 



This species is more or less related to Melampsora Larici- 

 pentandrae Kleb., as shown by the position of the teleutospore 

 layer, by the thickness of the apical cell-wall, and by having the 

 Caeoma stage on the leaves of LaHx sps. On the other hand, 

 there are characteristic differences, as follows: (1) The uredo- 

 spore layer of the fungus in question is hypophyllous, while that 

 of the other is epiphyllous; (2) The uredospores of our species 

 are considerably shorter than the spores described by Klebahn 

 (26-44X12-16 /*); (3) The teleutospores of our form are so 

 decidedly larger that even the smallest can hardly be compared 

 with the largest of the spores described by Klebahn (28-38 X 

 6-11 /x). 



Melampsora on Popllus balsamifera 



As already stated in my previous paper, the author noticed 

 an abundance of Caeoma on the leaves of Chelidonium majus at 



