332 Journal of Agricultural Research vol. vm, NO. 9 



SUMMARY 



(1) All four types of rust sori have been found developing internally 

 in the host-plant tissue, producing spores which appear quite normal 

 and which fill intercellular spaces or force aside the softer tissue. 



(2) The fact that Cronartium ribicola Fisher produces internal telia 

 is here reported for the first time. These telia form spores inside the 

 petioles of species of Ribes, chiefly in the pith and pericycle region. 



(3) Internal sori should be regarded as rather common teratological 

 phenomena. 



LITERATURE CITED 



(1) ADAMS, J. F. 



1916. Internal uredinia. In Mycologia, v. 8, no. 3, p. 181-182, pi. 186. 



(2) BOLLEY, H. L., and PRITCHARD, F. J. 



1905. Internal infection of the wheat grain by rust A new observation. In 

 Science, n. s. v. 22, no. 559, p. 343-344- 



(3) FROMME, F. D. 



1912. Sexual fusions in the flax rust. In Bui. Torrey Bot. Club., v. 39, no. 3, 



p. 113-131, pi. 8-9. 



(4) 



1914. The morphology and cytology of the aecidium cup. In Bot. Gaz., v. 58, 

 no. i, p. 1-35, 8 fig., pi. i-2. 



(5) PRITCHARD, F. J. 



1911. A preliminary report on the yearly origin and dissemination of Puccinia 

 graminis. In Bot. Gaz., v. 52, no. 3, p. 169-192. pi. 4. 

 Cites W. J. Smith (p. 173). 



(6). . 



1911. The wintering of Puccinia graminis tritici E. and H. and the infection 

 of wheat thru the seed. In Phytopathology, v. i, no. 5, p. 150-154. 2 

 fig., pi. 22. 

 (7) WOLF, F. A. 



1913. Internal aecia. In Mycologia, v. 5, no. 6, p. 303-304, pi. in. 



