Hedgcock & Hunt: Coleosporium 



299 



were infected bearing mature uredinia in 14 to 18 days, and 

 mature telia in about 2 months : 2 Ipomoea caroliniana, 1 I. lacu- 

 nosa, 3 /. pandurata, 1 /. triloba, 1 Pharbitis barbigera, 2 P. 

 hederacea, and 3 Quamoclit coccinea. 



In the foregoing experiments all plants of species of Calonyc- 

 tion and Convolvulus failed of infection, although the majority 

 were in prime growing condition. The plants of Calonyction 

 aculeatum were grown from seed from a plant ' heavily infected 

 with the rust in nature. 



Coleosporium ipomoeae is known to occur in its aecial stage in 

 nature on six species of pine. In this stage its range is from 

 Pennsylvania to Florida and Texas. It is now reported for the 

 first time on Pinus caribaea from Florida. In its uredinial and 

 telial stages it occurs over a much wider territory, ranging from 

 New Jersey and Kansas on the north to Florida and Texas on 

 the south. In these stages it is found on species of Calonyction, 

 Convolvulus, Ipomoea, Pharbitis, and Thyella. It has been suc- 

 cessfully inoculated by the writers on Ipomoea caroliniana, I. 

 lacunosa, I. pandurata, Pharbitis barbigera, P. hederacea, and 

 Quamoclit coccinea. 



The two most common and susceptible host species for the 

 uredinial and telial stages of Coleosporium ipomoeae are Ipo- 

 moea pandurata and Pharbitis barbigera, of which the former 

 has a much greater range. The most common and susceptible 

 host species for the aecial stage is Pinus echinata. 



Coleosporium ribicola 



Coleosporium ribicola (Cooke and Ellis) Arthur was first de- 

 scribed in the uredinial stage by Cooke and Ellis 5 in 1878, as 

 Uredo ribicola. The telial stage was described by Prof. Arthur 6 

 in 1907, and the fungus assigned to the genus Coleosporium. 

 Dr. Long 7 discovered and described the aecial stage and proved 

 its connection with the Coleosporium in 1916. 



s Cooke, M. C, & Ellis, J. B. New Jersey Fungi. Grevillea 6: 86. 1878. 



6 Arthur, J. C. North American Uredinales Jl 86. 1907. 



7 Long, W. H. The aecial stage of Coleosporium ribicola. Mycologia 8: 

 309-311. 1916. 



