152 EXPERIMENT STATION EECOED. 



growth. The studies, which were conducted in southern Arizona, lead to the 

 conclusion that the guayule shrub must be grown slowly, as under desert con- 

 ditions, in order to produce gum in its highest percentage. Irrigated plants 

 produce very little gum and an amount of woody tissue larger than is usual in 

 desert grown plants. 



Wood-using- industries of North. Carolina, R. II Simmons (N. C. Geol. and 

 Econ. Survey Econ. Paper 20, pp. 7//, pU. 6). — This report consists of a statis- 

 tical account with discussion of those wood-using industries of North Carolina 

 which produce finished commodities either directly from the log or from rough 

 lumber. The tables given show the sources of such wood used, the kinds of 

 lumber demanded by the wood-working factories, the price paid for each 

 species, quantity consumed, and purposes for which it was used. 



DISEASES OF PLANTS. 



Cultures of Uredinene in 1909, J. C. Arthur (Mi/cologla, 2 (1910), No. 5, pp. 

 2 1 3-2. ', ) .—Conthmmg previous work (E. S. R., 22, p. 451), 345 sowings were 

 made during 1909 from 91 collections belonging to about TO species of rusts, 97 

 species of hosts being employed for this purpose. 



In addition to cultures confirming previous work, successful new cultures are 

 reported and descriptions given of the following species: Puccinia ceanothi, 

 teleutospores from Andropogon haUii sown on Ceanothus americanus ; Gym- 

 nosporangium exiguum n. sp., teleutospores from Juniperus I'irginiana sown on 

 Crataegus pnnglei; G. comiculans n. sp., teleutospores from J. horizontalis sown 

 on Amclanchicr erecta and A. canadensis; G. trachysorum n. sp., teleutospores 

 from J. virginiana sown on Crataegus punctata, G. cocclnea and C. cerronis. 



Especially worthy of note are the cultures with P. pocuUformis, in which 

 successful cross inoculations (present and previous cultures) from various wild 

 and cultivated gi-asses by way of the tecidia on barberry, were made, indicating 

 that in the jecidial stage racial strains play no part, as the barberry acts as a 

 bridging host between each and every other gramineous host. 



A new genus of the Uredinaceae, E. J. Butlek {Ann. Glycol., 8 {1910), No. If, 

 pp. JflfJt-Jf.'iS, pi. 1). — The author discusses the affinities of a rust on the leaves 

 of Olea dioica from Bombay, India, intermediate in its generic characters be- 

 tween Hemileia and Ravenelia and isolated to Zaghouania, but differing from 

 them and all other known Uredinacese to such an extent that it is made the 

 type of a new genus and species, Cystopsora oleee, a technical description of 

 which is appended. 



Contributions to the study of the sooty naolds, G. Arnaud {Ann. Mycoh, 

 8 {1910), No. .'/. pp. JilO-'ilO). — In a taxonomic discussion of several species of 

 sooty molds, the author describes as new two species, as follows : Teichospora 

 {Capiiodiurn) mcridionale on the branches of Cist us nionspeJiensis, Citrus 

 deliciosa, Quercus suberis, and Nerium oleander, and T. olew on the branches 

 of Olea europcea. 



Studies on the behavior of the black rust of cereals in Bussia, A. von 

 Jaczewski {Ztsehr. Pflanzcnkranlc. 20 {1910), No. 6, pp. 321-359, figs. 8).— 

 The author discusses the various stages in the life cycle of the grain rust 

 (Puccinia graminis) and gives the results of exixu'iments on the germination 

 of the stylospores (spermatia), secidiospores, uredospores, and teleutospores, 

 and of cross inoculations of various wild and cultivated grasses with uredo- 

 spores and acidiospores. The stylospores (spermatia) were germinated after 

 24 hours in the sweetish liquid which exudes in minute drops from the pycnidia, 

 but further development after germination was not observed. 



