236 SUMMARY OF CUllRENT UESl!:ARCnES KELATING TO 



Short Cycle Uromyces of North America. — G. R. Bisby {Bot. Gaz., 

 1920, 69, 193-217, 1 pi.)- The writer gives an account of the genus, and 

 of work— cytological and other— done on the genus. There are eleven 

 species of short-cycle Uromyces in X. America, and he gives a detailed 

 description of each species. They occur in the higher and warmer 

 portions of the Continent and upon seven widely separated host families, 

 iilorphological evidence shows they are not inter-related, but are rather 

 associated with other rusts upon the same or related hosts. A. L. S. 



Two Russian Gymnosporangiese. — Jakob Eriksson (ArMv. Bot., 

 1919, 15, Xo. 20, 1-23, 2 pis., 1 col). One of these rusts *has been 

 determined by Eriksson as Gymnosporangium Oxycedri Bres. He was 

 able to produce the secidium stage on Crataegus monogyna, C. nigra and 

 Mespilus germanica. Other Fomacex — Sorbiis, Fyrtis, etc. — remained 

 immune. Another, Gymnosporangium tauricum sp. n., formed teleuto- 

 spores on Juniperus excelsa. It formed fecidia on Crataegus monogyna 

 and spermogonia on Cydonia vidgaris. Other Pomaceee — Fyrus, 

 Mespilus, Sorbus, etc. — were immune to infection. A. L. S. 



Uredinales of Guatemala based on Collections by E. W. D. 

 Holway.— J. C. Arthur {Amer. Journ. Bot., 1918, 5, 325-36, 420-40, 

 402-89). Arthur has pubhshed his results in three different papers. 

 A total of 600 rust specimens was collected by Holway during three 

 successive visits. In the first paper an account is given of the different 

 expeditions, and the Coleosporacese and Melampsorace^e are described 

 (twenty-two species), several of them new to science. The second paper 

 deals with ^Ecidiaceae, exclusive of Fuccinia, bringing the total up to 

 101 species ; the third paper takes up Fuccinia exclusive of species on 

 CarduaceaB. He finds that in the last group the most interesting are 

 the species on grasses ; such rusts are less common in the tropics. 

 Holway secured fifteen species, three of them undescribed. Holway 

 was also able to connect up an jEcial form on Eupatorium with a grass 

 rust on jFjgopogon, A. L. S. 



Selected Cycles in Gymnoconia Peckiana. — Gr. F. Atkinson 

 {^Amer. Journ. Bot., 1918, 5, 71>-83). This rust was considered to be 

 a short-cycle species with two generations. It is associated with Cseoma 

 nitens, a rust of raspberry plants. It has also been demonstrated that 

 the cycle may be further shortened by the lecidiospores germinating 

 in the manner normal for teleutospores, i.e. by the production of 

 promycelia and sporidia. The author confirmed this finding and 

 discusses the importance and the position in classification of Gymnoconiar 

 Ferlciana. A. L. S. 



Dothideaceous and other Porto Rican Fungi. — F. L. Stevens 

 {Bot. Gaz., 1920, 69, 24S-r)7, 3 figs, and 2 pis.). Stevens collected the 

 fungi described in Porto Rico ; they are all plant fungi occurring on 

 leaves or stems of various trees. There are a number of new species 

 and one new genus Hahtedia, the asci of which are borne in a locule in 

 a superficial stroma. A. L. S. 



