Hedgcock & Hunt: Coleosporium 309 



eastern United States. 19 It has been reported in the western 

 United States only on Pinus contorta from Montana and Colo- 

 rado. 



Coleosporium solidaginis, in its form on Solidago, has been 

 found occurring naturally in its uredinial and telial forms upon 

 about sixty species of Solidago, in all regions of the United 

 States, except in some of the southwestern states. It is now 

 reported for the first time on the following species: Solidago 

 ample xicaulis, S. austrina, S. bootii, S. brachyphylla, S. celtidi- 

 jolia, S. chandonnetii Steele, »S\ chapmanii, S. concinna, S. curtis- 

 sii, S. decumbens, S. drummondii, S. erecta, S. fistulosa, S. 

 glomerata, S. hispida, S. lancifolia, S. odor a, S. petiolaris, S. 

 pinensis (Porter) Small, 6\ pinetorum, S. pulverentula, S. 

 purshii, S. rigida, S. rigidiuscula, S. speciosa^ S. stricta, S. torti- 

 folia, S. unigulata, and S\ vaseyii. The form occurring on species of 

 Aster is known to occur on at least sixty species. In the eastern 

 United States, it is now reported for the first time on the follow- 

 ing species : Aster acuminatus, A. concinnus, A. corrigiatus, A. 

 hirsuticaulis, A. junceus, A. lowrieanus, A. oblongifolius, A. 

 pattulus, A. pringlei, A. schistoshts Steele, A. spectabilis, A. 

 tenuicaulis. In the western United States it is now reported for 

 the first time on Aster fremontii, A. frondosus, and A. viscosnm. 

 The form on the Aster has a range similar to that on Solidago. 



Coleosporium solidaginis of the Solidago form in the eastern 

 United States has been successfully inoculated by the writers 

 from its telial stage on Pinus caribaea {P. heterophylla) , P. 

 coulteri, P. echinata, P. nigra austriaca, P. radiata, P. rigida, P. 

 scopulorum, and P. taeda, and in its aecial stage upon Solidago 

 bicolor, S. canadensis, S. chapmanii, S. fistulosa, S. hispida, S. 

 juncea, S. monticola, S. multiradiata, S. neglecta, S. pulverula, 

 S. riddellii, S. rugosa, S. rupestris, S. serotina, S. speciosa, and 

 vS\ squarrosa. 



The results of our inoculations indicate that in the eastern 

 United States Coleosporium solidaginis is a rust attacking species 

 of Solidago but not those of Aster. The Coleosporium on spe- 



19 Rhoads, A. S., Hedgcock, G. G., Bethel, E., & Hartley, C. Host Re- 

 lationships of the North American Rusts, other than Gymnosporangiums which 

 attack Conifers. Phytopathology 8: 324. 1918. 



