1188 EXPERIMENT STATION RECORD. 



Mucor cultures, D. K. Sumstink ( ticicncr, n. xcr., 2!) (1900), No. 737, p. 

 267). — A study is reported of the common mold {Mucor stolonifer) made to 

 detiM-iiiine the development or nondevelopment of zygospores. In all. almui I'.ooo 

 cultures \A'ere examined and not a single zygospore found. 



C'ultuics were made on different media and placed under conditions where 

 n.xygcii was wanting, to determine the necessity for oxygen in the growth of 

 zygospores, but no zygosjiores were obtained. 



Further studies on anthracnoses, C. L. Shear and Anna K. Wood (Abs. iti 

 Science, n. ner.. 2'.) (UK)!)), No. 7.J7, pp. 272, 27.i). — In continuation of previous 

 studies ( E. S. K., IS, p. 1141) 2.'> forms of Colletotrichum and (ihjeosporium have 

 been studied from different species of plants. Cultures have been made, the 

 fungi compared, and cross inoculation experiments carried on. but no mor- 

 phological characters have been found to be sufficiently constant to justify the 

 segregation of species except perhaps in the case of the cotton anthracnose. 

 The characters of Gloeosporium iGlomcreUn) rufotnacultiiix represent fairly 

 well the essential chai'acters of all. 



Cross inoculations from forms on fruits seem to indicate that the fungus may 

 soon adai)t itself to a different host and after a few generations develop almost 

 as readily on one fruit as on another. All the so-called species are believed to 

 be slightly specialized physiological forms of one omnivorous species. 



Cultures of Uredineae in 1908, J. C. Arthur (Abs. in Science, n. .scr., 29 

 (1909), No. 737, p. 270). — An account is given of the tenth consecutive season's 

 cultures of various species of rusts made from the resting as well as the sum- 

 mer spores. xVmong the various facts presented, the author states that for the 

 first time in America the early or brown rust of rye was grown on Anchiisa sp., 

 being sown early in July. A similar rust on wheat failed to germinate so soon 

 after maturity, seeming to settle the identity of the so-called Puccinia dispcrsa 

 of Europe and America. Trials with the rust of timothy (P. plileipratensis) 

 failed to infect barberry plants, in this respect agreeing with European studies. 



During the season's investigation considerable information was added regard- 

 ing the life history of species of Gymnosporangium, and the life cycle was dem- 

 onstrated for one species from the Southern States, one from the Northern 

 States, and one fi-om west of the Rocky Moinitains. 



Notes on Sclerospora graminicola, G. B. Traverso (Nuoro Gior. Bot. Itdl., 

 n. .s-rr., /.'/ (1907), No. .'/, pp. 57')-57S). — A study was made of .s'. fjrnminicohi. a 

 common parasite of Setahn itnJica. As a result of inoculation and other ex- 

 periments, the author concludes that the form commonly occurring on the 

 Italian millet is quite distinct from the species, and he describes it as S. gram- 

 inicola ftetaricr-itaUccc. 



A leaf blig-ht of beans, T. Fkrraris (Riv. Patol. Vcfj., 3 (1909), No. 16. pp. 

 2'tl-2'i'i) . — A description is given of a disease of beans in which the leaves be- 

 come dried and blackened. The cause was found to be the fungus Altcrnaria 

 brassic<r phn.seoli. and the disease is said to liave occurred rather widely in 

 Italy (luring liKt.S and to have caused considerable loss. A wet spring followed 

 by high temperatures in June and July is said to favor the develojmient of the 

 fungus. For the prevention of its attack sjiraying with Bordeaux mixture or 

 soda Bordeaux mixture is recommended. 



Artificial cultures of Phytophthora with special reference to oospores, 

 G. P. Clinton (Abx. in Science, n. .srr., 29 (1909), No. 737, pp. 271, 272). — In a 

 previous report (E. S. R.. 18, \\ 4.S) the author gave the results of investiga- 

 tions with species of Phytoiththora. In the ]iresent account he gives notes on 

 the absence of oosjiores from jiotato mildew and their presence in other species 

 of I'hytoiihthora. due i)ossibly to distinct sexual mycelia. This is indicate<l by 

 observations that the antlieridia and oogonia of the other two species (P. pliase- 



