Hedgcock, Hunt, Hahn: Coleosporium 195 



Aster, Chrysopsis, Coreopsis, Elephant op us, Euthamia, Heli- 

 anthus, Ipomoeae, Pharbitis, Solidago, V erbesina, and Vernonia 

 known to be susceptible to species of Coleosporium. In 9 of 

 these experiments, plants of species of Vernonia only were in- 

 fected ; in one experiment, plants of species of both Vrnonia 

 and Elephantopus ; and in 8 experiments there was no infection. 

 Control plants in each experiment remained free from infection. 



In our inoculations with sporidia from the telia of both Coleo- 

 sporium elephant opodis and Coleosporium carneum trees of Pinus 

 echinata were infected the following year, bearing aecia of the 

 species used in inoculations, proving that this species of pine is 

 a host for both species of Coleosporium. 



Of 54 collection of Peridermium intermedium Am. Auct. on 

 Pinus echinata collected by members of this office in Alabama, 

 Arkansas, Florida, Georgia, Mississippi, North Carolina, South 

 Carolina, Tennessee and Texas ; nearly 40 apparently belong* to 

 Peridermium carneum and the remainder to Peridermium ele- 

 phantopodis. 



Arthur and Kern (3) in 1906 described Peridermium inter- 

 medium from specimens collected on the needles of Pinus echinata 

 by C. H. Demetric at Perryville, Missouri. The description of 

 the species agrees in part with that of Peridermium carneum and 

 in part with that of Peridermium elephant opodis as given by us 

 earlier in this paper based on specimens on Pinus caribaea grown 

 from artificial cultures at Washington, D. C. It is not wise to 

 assign the type collection of Peridermium intermedium at present 

 to either of these species, since we have never had the oppor- 

 tunity to section and examine aecia of the type collection. We 

 have, however, sectioned and examined part of the exsiccati 

 which had previously been examined and assigned to Peridermium 

 intermedium either by Arthur or by Kern, which we -assign as 

 follows : Collection by H. von Schrenk, Eureka Springs, Arkan- 

 sas, May 23, 1906 (noi) belongs to Coleosporium elephanto- 

 podis; collections in North Carolina by H. von Schrenk (1099) 

 and C. D. Howe (20718) and R. P. Dale, Okay, Arkansas 

 (15353) belong to Coleosporium carneum. There is always the 

 possibility that any older collection may have two species inter- 



