PHRAGMIDIUM. 



363 



On species of Potent ilia : 



Phr. fragariastri (1). C.) (Britain and U.S. America). 



Phr. potentillae (Per.s.) (U.S. America). 



Phr. tormentillae Fuck. (Britain.) 



Phr. papillatum Dietel, from Siberia. 



Phr. nepalense Baicl. and Phr. laceianum Barcl. in India 



On species of liuhus : 



Phr. rubi (Pers.) (/'/a: l»dhomm 

 Schlecht.) (Britain). 



Phr. rubi-idaei (Per.s.). On leaves 

 of raspberry. (ihitain and l".S. 

 America.) 



Phr. violaceum (Schultz) (Hritain). 



Phr. rubi-miniatum J. .Miill. 



Phr. albidum (Kidni). 



Phr. quinqueloculare Barcl. 



Phr. octoloculare Barcl. 



Phr. Barclayi Dietel, from Hima- 

 laya. 



Phr. gracile Farl., America. 



And other species. 



On Sanguisorha : 

 Phr. sanguisorbae (D. C.)". On 

 SanguixorhK 'iiiinor. (pjritain.) 



Phr. carbonarium (Sclilecht.) 

 (Ijritain). This species has also 

 been placed in a separate genus 

 Xenodochus. It occurs on San- 

 guisorha. Uredospores are want- 

 ing ; the teleutospores form firm 

 black crusts ; the aecidiospores 

 form chains ; and the paraphyses 



are club-shaped. Diseased leaves and petioles ure thickened and 

 bent. Wakker'.s investigation showed : a slight enlargement of 

 parenchymatous cells and rupture of epidermis on spore-formation ; 

 a diminution in the intercellular spaces and in formation of 

 collenchyma and sclerenchyma ; a suppression of all production 

 of chluropliyll and calcium o.xalate. 



Fig. 195. 

 frutkoeus. 



lUiViii ruhi from Hubus 

 erical iimiuvture te- 



leutospore, and two well-developed and 

 germinating ones. (After Tulasne.) 



Melampsora. 



Teleutospores dark and unicellular, in some cases niulti- 

 celhdar l)y formation of new walls, generally in a vertical 



