DISEASES OP PLANTS. 1149 



a'wrn 1() the difTcrt'iit forms :iih1 the .i,'c()j,'r:ii)liic:il (listrihulioii of Castilla nililtc)- 

 aiid to iilaiitiii.i:: operations in Central America and Mexico, with special atten- 

 tion to tln' cnllnre. tapping; operations, and preparation of Castilla rubber on 

 the La Zacualpa plantation, together with au outline of the experiments which 

 are being conducted at the La Zacualpa Botanical Station and Rubber Labora- 

 tory. 



An attempt was made to cultivate the Ceai'a rubber in Mexico in the vicinity 

 of La Zacualpa at an elevation of 2,000 ft. The trees have not developed well, 

 but tlie amount of latex is reported as satisfactory. Tapping experiments are 

 to be conducted with these trees. A brief account is also given of the ])roduc- 

 tion of Guayule rubber in northern ^Mexico. 



Para rubber from the Federated Malay States (Bui. Imp. Iii'<f., •> (IHOl). 

 \<>. .)'. PI). 2.'/()-2.'/.S), — Tabulated data are given showing the analyses of 1«; 

 saiu|p|('s of I'ara rubber illvrcd hrasilirnsis) forwarded from the Federated 

 .Malay Stat<>s to tlu> Imi>erial Institute. Eleven of the samples were found to 

 contain over 04 per cent of caoutchouc, the poorest sample analyzing 02.(;4 i)er 

 cent. From these results it is believed that a high degree of purity can be ob- 

 tained in the preparati«»n of Para rul)ber from cultivated trees in the Federated 

 Malay States, 



Rubbers from the Gold Coast (Bui. lint). Inst., o (W07), No. 3, pp. 2.'/8- 

 2'>1). — Kei'orts on analyses of samples of Ceara {Manihot glaziovli), Assant 

 (Ficiist chistica), '* Krepi Ball" {LandolpMa otvariensis) , and " Ofrimtum " 

 ( Fiiiifinnia clastica) rubber received from the Gold Coast. The Krepi Ball 

 rubber showed the highest content of caoutchouc, analyzing ni..3 per cent, 

 whereas the Ceara rubber analvzed only (!7.7 per cent caoutchouc. 



DISEASES OF PLANTS. 



Notes on certain rusts, with special reference to their peridermial stages, 

 G. P. Clinton {Ahs. in Science, n. ser., 27 {1!)()S), No. (J87 p. S'/O). — Notes are 

 given on the ipcidial stages of some heteroecious rusts, which are grouped under 

 the form genus Peridermium, but which in their teleutospore stages are recog- 

 nized as different genera. 



A number of these species are enumerated, and during the past year the author 

 made a special study of various stages of such of these rusts as occur in Con- 

 necticut. Through field observations, confirmed by inoculation tests, the re- 

 lationships of two additional species are now known. Pendermium pyriforme, 

 which isfound on Finns sylvestiis and P. rigidn, is known to be the recidial stage 

 of Cronartiiiin coniptonia', on Coniptonid usplenifolifi. Periilenniiiin eonsiinilc, 

 on Ficra nigra, is in a similar way connected with Mehiinpsoropsis cd.s.sandi'w, 

 on Cns-sandra calyculuta. There is some evidence also that /'. pcckii, occurring 

 on Tmiiga canadensis, is the ;ecidial stage of Chrysomyxa albida, on Rnbus his- 

 pidns, but further proof is needed before this is definitely established. 



Notes on a parasitic Gnomonia, C. AV. Edgebton (Bui. Torrey Bot. Club, 3Jf 

 (inoi). \o. 1.1, pp. 59.3-597, figs. 3).— While making a study of anthracnose of 

 blackberry canes, the author reports having found a few canes affected by the 

 fungus (inomonia rubi. A study of the disease showed that the fungus had 

 no connection with the Glff-osporium causing the anthracnose. The fungus is 

 apparently unrecorded in this country and it is believed it may occasionally 

 cause a disease of the blackberry canes. 



The disease seems to make its ai)pearance in the sj)ring, but no effect is 

 noticed on the canes for sometime. The leaves develop normally, blossoms 

 appear on the stems, and the fruit sets, but after the fruit has become al)out 



