Parasitic Fitnt/i of Illinois. 221 



April 19, 4176, April 28, 4367; Pulaski, May 1, 4403, May 6, 

 4531. May 9, 4578; Johnson, May 13, 4670; McLean, May 23. 

 4749, May 26, 4791; Champaign, June 8, 4903; LaSalle, June 

 16, 5208; Adams, July 3, 5387. 



Schweinitz (Syn. Car. 458) calls this .Kcidium nit-ens, and 

 afterwards (Syn. N. A. Fungi) Cceoma (sub-genus ^Ecidium) 

 linn/iKituni. The last name has been most often used, but 

 without proper authority. 



This is the well known orange rust of the blackberry, and 

 more rarely of the black-cap raspberry, occurring for the most 

 part in May and June. It is unquestionably a first form or 

 undeveloped state of some teleutosporic species, and this has 

 been thought to be a Pliragmidmm. Some recent observation, 

 however, tends to show that it belongs to Puccinia Peckiana, 

 Howe, which is found on the same host-plants, and matures in 

 September. 



jEdDlUM, PERSOON. 



Spores one-celled, in chains or vertical rows, without pedi- 

 cels; sorus inclosed in a short, beaker-like pseudoperidium. 

 which protrudes through the ruptured epidermis of the host, and 

 opens regularly at the vertex, the border soon becoming more 

 or less toothed or lobed. and usually recurved; with sperma- 

 gonia. 



This was supposed to be a true genus of automatons species, 

 but it is now believed that all the supposed species belong to 

 Uromyces and Pu-ccinia, and constitute what is known as their 

 first or aecidial stage in the alternations of development. Be- 

 fore, however, anything like exact knowledge as to genetic re- 

 lations can be ascertained, carefully made artih'cial cultures 

 must be made by competent investigators. Where there is 

 now good reason for accepting the demonstrations as satisfac- 

 torily made, the forms have been included in their proper 

 places with the teleutospores; otherwise they follow here under 

 the designation of species. 



M. ranunculacearum, DC. 



Hypophyllous. Spots distinct, yellowish, mostly small: 

 recidia irregularly and densely clustered, short, erect, or at 



