The common Parasite of the Powder_y Mildews 





By David (iKirrrnrs 



(ri.ATK 358) 



p 



Ampelomvces ouisqualis Cos. Bot. Zcitung 10 : 301. 1852. . 



Cicinoholus florcntiuus Ehr. Bot. Zeitung il : 16. 1853. 

 Bassocystis tcxtilis Ricss. Bot Zeitung 11 : 236. 1853. 

 CiciJiohoIus ccsatii DcBaiy, Morph. und Thys. dcr Pilze, 3:53- 



75. //. 6, 7. 



Cicinobolus oidiiTvxck, Rabenhorst, Fungi Europaci, No. 2215. 



Ciciuoholus lunnu/i Faut. Revue My col. I2 : ^y. 1890. 

 Cicinoholus cotoncus Pass. Thucnicn Mycothcca Universalis, 17 : 



No. 1668. 



Cicinoholus luicinulac Faut. Roumeguere Fungi Selecti Galliae 



43 : No. 6208. 



Cicinoholus viajorY^QW & Swingle, Herb. J. B. Ellis, 37 : No. 84. 



This plant attracted my attention a number of years ago on 

 account of its abundance ; a subsequent study of it in the field and 

 laboratory has revealed some interesting facts. Its abundance on 

 the forms of Erysiphc cichoraccanon growing on Gruidclia squar- 

 rosa in the Northwest is very noticeable. My first collection of it 

 at Aberdeen, South Dakota, was made in 1893, but on account of 

 the entire absence of fruit in the host {Erysiphc), I was unable to make 

 any specific determinations. Although a careful search for fruit 

 ing specimens was made in the same locality for the next five years 

 none were found. The conidial stage occurred in abundance and 

 it was almost invariably accomiDanicd hy \\\^ Auipcloviyccs, While 

 in company witli Mr. L. W. Carter in w^estern South Dakota and 

 northeastern Wyoming in 1897, I collected fine fruiting specimens 



iph 



Dakota and at 



Moorcroft, Wyoming. The former was unaffected by the fungu*?, 

 while the latter had practically no pcrithecia in a healthy condition. 

 The latter was as fine an illustration of parasitism as one could 

 wish to see. There was at least one-half acre of the Grindclia on 

 a small creek bottom growing as thick as it could well stand, and it 

 w^ould have been difficult to find any leaves in the whole patch 



( 184 ) 



