340 



SCIENCE 



[N. S. Vol. XXVII. No. 687 



It is suggested that the present ideas 

 may be of application to the Alps as well. 



Cultures of Uredinece in 1907 : Professor J. 



C. Arthur, Purdue University. 



Eighth annual report on culture work 

 with plant-rusts. Nearly one hundred col- 

 lections with resting spores and a fifth as 

 many with active spores were employed. 

 The culture of seventeen species was at- 

 tempted, with only negative results. 

 Thirty species were grown with success, 

 eight of which are now reported for the 

 first time. Of the latter Puccinia vexans 

 and P. Cryptandri were grown from 

 amphispores, being the first amphisporic 

 cultures ever made. Three sedge rusts 

 were connected with secial forms, an 

 Allium rust carried through its cycle and 

 two species of Gymnosporangium, G. 

 Betheli and G. inconspicuum connected 

 with ascial stages. 



Notes on Certain Busts, with Special 

 Reference to Their Periderrmal Stages: 

 Dr. G. P. Clinton, Connecticut Agri- 

 cultural Experiment Station. 

 The Peridermiums (a form genus which 

 occurs on coniferous hosts) are the aecial 

 stages of heteroecious rusts which belong, 

 in their telial stages, to at least seven dif- 

 ferent genera as now recognized. So far 

 there have been found in North America 

 forty-nine species belonging to these 

 genera, while only thirty species of the 

 Peridermiums are known here. Investiga- 

 tions so far have definitely connected only 

 a few 6f these species. Shear has shown 

 that Peridermium cereirum belongs to 

 Cronartium Quercus; Kellerman, that 

 Peridermium Bostrupi belongs to Coleo- 

 sporium Campanula; and the writer, that 

 Peridermium acicolum belongs to Coleo- 

 sporium Solidaginis. European investiga- 

 tors have solved the relationships of three 

 or four other species whose fecial or other 

 stages have been found here, but these re- 



sults have not yet been confirmed with 

 American material; and American writers 

 have suggested the possible relationship of 

 a few more species. During the past year 

 the writer made a special study of the 

 various stages of such of these rusts as 

 occur in Connecticut, with the result that 

 through field observations, confirmed by 

 indoor inoculation tests, the relationships 

 of two more species are now known. Peri- 

 dermium pyriforme, which was found on 

 Pinus sylvestris and Pinus rigida, was 

 found to be the secial stage of Cronartium 

 ComptonicB on Comptonia asplenifolia; 

 and Peridermium consimile, on Picea 

 nigra, was connected with Melampsoropsis 

 Cassandrce, on Cassandra calycidata. 

 Some evidence was also obtained that pos- 

 sibly Peridermium, Pechii, on Tsuga cana- 

 densis, is the fficial stage of Chrysomyxa 

 alhida, on Bubus hispidus; but further 

 proof is needed before this can be stated 

 positively, since there are certain points in 

 their structure that also make it unlikely 

 that they have any relationship. 



Further Studies of the Anthracnoses : Dr. 

 C. L. Sheae and Miss Anna K. Wood, 

 Bureau of Plant Industry. (By title.) 



Sporangia, Conidia and Zygospores in the 



Genus Choanephora: Professor A. F. 



Blakeslee, Connecticut Agricultural 



College. 



Choanephora curcuhitarum (B. & Rav.) 

 is one of the mucors found not infre- 

 quently infecting withered squash blossoms 

 and causing a soft rot of the fruit. Up to 

 the present time only the QSdocephalum- 

 like conidial stage has been found in this 

 country and its connection with the mucors 

 has been somewhat in doubt. By culti- 

 vating the fungus at a temperature of 

 about 25° C. under proper conditions of 

 moisture, the writer has obtained the 

 sporangia and the zygospores. The species 

 is heterothallie and its ( + ) and ( — ) races 



