204 SUMMARY OF CUUKENT KKSEARCHES RELATING TO 



Uredineae.* — P. Magnus records the infection of an introduced plant 

 by a Uredine common in the district, into which it had been imported. 

 Chrysomyxa Rhododendrl produces the uredo- and teleutospores on species 

 •of Rhododendron ; the ^Ecidium grows on the needles of Pkea excelsa. 

 Ficea pmiffens var. glama was imported from the Rocky Mountains and 

 planted in a garden along with the Rhododendrons infected by the 

 ■Chrysomyxa. In due time the Mcidla appeared on the leaves of the 

 American plant. He notes other cases in which a similar change of 

 host has taken place. 



Paul Cruchet f concludes the account of his experiments with Pm- 

 ■cinia Mentlm on various host-species. He finds eight biological forms 

 within the parasite growing on Mentha and Satareya. A careful mor- 

 phological examination showed that there was no marked difference 

 between any of the forms. The JEcidia are exactly alike in every case 

 observed. The uredospores and teleutospores were also compared, and 

 no real distinction was noted. He records the results of 38 different 

 ■experiments. 



Frank D. Kern | gives an account of the rusts collected by W. A. 

 Kellerman during a journey to Guatemala. In many instances, he tells 

 us, new hosts have been added and the geographical distribution has 

 ■often been extended. Several new species are included in the list, 

 which comprises 40 plants. 



Indian wheat rusts are examined and discussed by E. J. Butler and 

 •J. M. Hayman.§ They are Fi/ccinia graminis, P. ylumarum and P. 

 triiicma. The peculiar climatic conditions of India are taken into 

 .account, and the absence of j^cidium forms, which raises the question 

 ■of the continued propagation of the parasite. Methods for checking 

 rust attiicks are also described. 



New Genera of Uredinales.|| — J. C. Arthur establishes four new 

 genera in this group : Folio ma type species Faceiiiia iiivea, with only 

 spermogonia and teleutospores ; Spirechina, which possesses uredo- and 

 teleutospores ; Frospodium, with spermogonia, uredo- and teleutospores, 

 .the sori of both surrounded by paraphyses ; and NephJyctis, with spermo- 

 gonia and teleutospores only, without peridium or paraphyses. He has 

 'taken into account the morphological characters, life-cycle and family of 

 the hosts in making these new genera. 



Monograph of the Genus Ravenelia.lT— P- Bietel traces the history 

 ■of this genus of the Uredineae from the record of the first species by 

 Schwenitz in 1822 as Spfueria epiphylla down to the present day. He 

 then studies the morphology of the different stages in the life-history : 

 ■of the mycelium, which penetrates the leaf or stem tissue, and in one 

 instance at least is perennial ; the JEvidki, which occur but seldom ; the 

 uredospores, which vary much in form, and the peculiar and character- 

 istic teleutospores. These latter are composed of three parts ; a stalk, 



* Ber. Deutsch. Bot. Gesell., xxiv. (1906) pp. 474-6. 

 t Centralbl. Bakt., xvii. (1906) pp. 395-411. 

 : Journ. MycoL, xiii. (1907) pp. 18-26. 



§ Mem. Dept. Agric. India, Bot., i. No. 2 (1906) 52 pp. (5 pis.). 

 II Journ. MycoL, xiii. (1907) pp. 28-32. 

 \ Beih. Bot. CentralbL, xx. (1906) pp. 348-413 (2 pis.). 



