726 CONNECTICUT EXPERIMENT STATION REPORT, 1909-1910. 



are embedded as small black specks, chiefly on the upper surface 

 of the leaves. It is not an important disease of this host. 



CHIVES, Allium Schcenoprasum. 



RUST, Puccinia Porri (Sow.) Wint. This rust was collected 

 by Dr. Britton during June, 1910, on chives in his garden in 

 Westville, where it was doing considerable injury to the plants. 

 Both the II and III stages were present, the former showing 

 as minute, reddish, dusty pustules, and the latter as black, granu- 

 lar ones, more permanently covered by the epidermis. The 

 leaves, when fairly abundantly infected, turned yellow and died 

 prematurely. I have not seen any account of injury by this 

 rust to cultivated species of Allium in this country, though in 

 Europe it is not uncommon. Worthington Smith, in his Dis- 

 eases of Field and Garden, page 39, mentions it, under the name 

 Puccinia mixta Fckl., as causing serious injury to a crop of chives 

 in England. There is more or less difficulty in deciding the 

 proper genus of this fungus, since the telial spores in some 

 specimens on certain hosts are almost or entirely single-celled, 

 and so properly come under the genus Uromyces; other speci- 

 mens show these spores largely two-celled, and so place it more 

 properly under the genus Puccinia. Our specimens run more 

 nearly to the former type, as not over one or two per cent, 

 of the spores are two-celled. Winter considered the two as 

 a single species, and we have followed him. Other writers 

 place the single-celled form under Uromyces ambiguus (DC.) 

 Fckl., and the form with most of its spores two-celled under 

 Puccinia Porri, as given here. The rust on chives in Europe 

 is generally reported under this latter name. Our specimens, 

 however, have fewer two-celled spores than those we have seen 

 from Europe on the same host. Puccinia Allii (DC.) Rud., 

 also on species of Allium, is quite a different fungus. 



CORNFLOWER, Centaurea Cyanus. 



RUST, Puccinia Cyani (Schl.) Pass. Both the II and III 

 stages of this rust were found, causing severe injury to the 

 cornflowers in the writer's garden during the summer of 1909. 

 The sori, while numerous, form rather inconspicuous, dusty 

 outbreaks on both surfaces of the leaves and on the stems 



