246 EXPEKIMENT STATION" RECOED. [Vol.36 



Eclipta alba and on having inoculated susceptible plants with this organism. 

 The first host species is said to be rather resistant to the organism, while the 

 second is quite susceptible. 



Life histories of Melanops, O. L. Shear and Miss A. M. Beckwith (Abs. in 

 Phytopathology, 6 (1916), No. 1, p. 109). — Melanops is reported us having been 

 found on 13 hosts and grown in pure cultures from them. Some of the cul- 

 tures produced Dothiorella micropycnospores and macropycnospores. Other 

 cultures gave a Sphteropsis of the S. malorum type. The taxonomic status of 

 the organisms on the different hosts is being investigated. 



Morphology and developmental conditions of Solerotinia trifoliorum, V. 

 Peglion {Atti R. Accad. Lincei, Rend. CI. Sci. Fis., Mat. e Nat., 5. ser., 25 

 (1916), I, No. 7, pp. 521-524). — Describing a study of the forms and behavior 

 of S. trifoliorum, the author states that while the fungus extended itself readily 

 by means of mycelial fragments, he was unable to obtain in a single case 

 germination of the sporidia. He admits that the biological significance of these 

 bodies is still unknown. 



The perfect stage of Septoria ribis,R. E. Stone (Abs. in Phytopathology, 6 

 (1916), No. 1, p. 109). — As a result of three seasons' work, the author concludes 

 that MycospJicerella grossularice is the perfect stage of S. ribis. The only 

 previous collection of the perfect stage of the fungus in 'America is said to 

 have been that reported by Pammell from Iowa (E. S. R., 3, p. 217). 



Observations on the occurrence of Puccinia glumarum in the United States, 

 H. B. Humphrey and A. G. Johnson (Abs. in Phytopathology, 6 (1916), No. 1, 

 pp. 96, 97). — This rust, which was first reported in the United States by Carle- 

 ton in 1915 (E. S. R., 33, p. 744), is said to have been observed on Triticum 

 vulgare, T. compactum, T. durum, T. polonicuni, T. spelta, Secale cereale, Hor- 

 deum vulgare, H. miirinum, Elymus canadensis, and Bromus marginatus. The 

 most severe epidemic was observed at Moro, Oreg., where the grain was grown 

 without irrigation and where the average rainfall is approximately 11 in. Cer- 

 tain varieties showed an estimated infection of from 70 to 90 per cent, and 

 contrary to the results reported from Europe the varieties at Moro showing the 

 severest infectious gave the highest yields. 



Biologic forms of Puccinia granainis on wild grasses and cereals, E. C 

 Stakman and F. J. Piemeisel (Abs. in Phytopathology, 6 (1916), No. 1, pp. 99, 

 100). — A preliminary report is given of an investigation of the biologic forms 

 of P. graminis. 



P. graminis tritici is said to infect barley, wheat, Hordeum jtibatum, H. spar- 

 tinum, Elymus canadensis, E. virginicus, E. robustus, Agropyron occidentale, 

 Bromus tectorunv, and Hystrix patella. Rye was attacked only weakly. Other 

 species of Agropyron have been infected in the greenhouse and rust has been 

 observed on some of them in the field, but it is not yet known whether it 

 occurs on them commonly. 



P. graminis secalis is found to infect rye, barley, Hordeum jubatum, H. spar- 

 tinum; E. canadensis, E. virginicus, E. robustus, A. repens, A. tenerum, A. occi- 

 dentale, A. caninum, A. cristatum, A. imbricatum, B. tectorum, and Hystrix 

 patula. 



P. graminis avence was found capable of attacking oats, Avena fatua, A. 

 elatior, Anthoxanthum odoratum, Holcus lanatus, Phalaris canariensis, Koeleria 

 cristata, Dactylis glomerata, and B. tectorum. It weakly infects barley, E. 

 canadensis, Loliunv italicum, L. perenne, and Festuca elatior. 



Attempts to change the parasitism or increase the host range of the various 

 biologic forms by means of bridging hosts have proved unsuccessful. The bio- 

 logic forms, when isolated, have so far remained sharply fixed. 



