300 



Mycologia 



The following inoculations have been made with Coleosporium 

 ribicola: 



During 191 7, three sets of inoculations were made with aecio- 

 spores from aecia collected on Pinus edulis at Poncha by E. Bethel 

 and the writer, and at Stonewall, and Trinidad, Colo., by E. L. 

 Johnston and the senior writer. The following plants were 

 inoculated: 1 Grossularia inermis (Rydb.) Gov. & Britt., 5 Ribes 

 aureum Pursh., 1 R. malvaceum Sm., 2 R. nigrum L., and 2 R. 

 odoratum Wendl. Of these plants, 2 R. aureum were infected 

 with the rust, bearing uredinia in 14 to 16 days. 



June 22, 1 91 8, aeciospores from aecia collected by E. Bethel 

 and the junior writer, June 15, on Pinus edulis near Del Norte, 

 Colo., were used to inoculate the following plants: 1 Grossularia 

 hirtella (Michx.) Sprach., 1 G. inermis, 1 G. inn ominat a Jancz., I 

 G. leptantha (A. Gray) Cov. & Britt., 2 G. missouriensis Nutt, 

 1 G. reclinata (L.) Mill., 3 Ribes alpinum L., 2 R. americanum 

 Mill., 2 R. aureum, 4 R. inebrians Lindl., 4 R. nigrum, 10 R. 

 odoratum, and 4 R. vulgare Lam. Of these plants, the following 

 became infected, bearing mature uredinia in 14 to 16 days and 

 telia by August 1 : 1 Grossularia hirtella, 1 G. inermis, 1 G. in- 

 nominata, 1 G. leptantha, 1 G. missouriensis, 1 G. reclinata, 4 

 Ribes inebrians, 1 R. nigrum, 3 R. odoratum, and 3 R. vulgare. 



The following additional species have been infected by inocula- 

 tion with urediniospores : 1 Grossularia divaricata (Dougl.) Cov. 



6 Britt., and 1 Ribes fasciculatum S. & Z. 



October 13, 191 6, sporidia from telia collected by the senior 

 writer on Ribes aureum at Denver, Colo., were used to inoculate 

 the needles of the following species of pine: 1 Pinus caribaea, 



7 P. edulis Engelm., 1 P. bungeana Zucc., 1 P. girardiana Wall, 

 1 P. mayriana Sudw., 1 P. monophylla Torr. & Frem., 1 P. pinea 

 L., 2 P. rigida, 1 P. serotina, 3 P. strobiformis Sudw., 3 P. strobus, 

 3 P. taeda, and 6 P. virginiana. Of these trees, 4 P. edulis and 

 1 P. pinea were infected, bearing numerous pycnia December 16, 

 1917, and very sparse aecia February 28, 1918. 



Coleosporium ribicola in its aecial stage resembles very closely 

 in gross morphology Coleosporium ipomoeae, and since the two 



