Parasitic Finir/i of TJJinoi.^. 221 



April 10. 4170. April 28. 48(17; Pulaski, May 1, 4403, May 6. 

 4531. May V). 4578: .lohnson. May 13, 4070; McLean, May 23. 

 4749, May 20,471)1; Champaign. . I inio 8.1003: LaSail.-. ".Iiin.> 

 10, 5208; Adams, July 3. 5387. 



Sclnveinit/ (Syii. Car. 458) calls this .KcidiiiDi iiifnis. and 

 afterwards ( Syii. N. A. Fungi) Ca'oma (suh-gcnus J'JridiiDn ) 

 hniiiiKifiiiii. The hist name has heen most often used, hut 

 without i)ro|>er authority. 



This is the well known orange rust of the hlackherry, 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 telentosporic species, and this has 

 been thought to be a PJirar/nii/h'mti. Some recent observation, 

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

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

 Sej)h'inl)er. 



^OIDIUM, Pkksoox. 



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

 cels: sorus inclosed in a sliort. l)eaker-like pseiuloperidium. 

 which protrudes through the ruptured e])idermis of the host, and 

 opens regularly at the vertex, the l)order soon becoming more 

 or less toothed m- lol)ed. and usually recurved; with s]>ernui- 

 gonia. 



This wassu])posed to be a true genus of automatons species, 

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

 Vroniyces and Piirrivia. and coiistitute what is know^i as their 

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

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

 lations can be ascertained, carefully made artificial 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. 



^. ranunculacearum, ix'. 



Hypophyllous. Spots distinct, yellowish, mostly small; 

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



