No. 5.] USTILAGINE^E OF CONNECTICUT. 3 1 



Urocystis Rab. 



The sori usually occur in the leaves or stems, where they 

 often cause considerable distortion, or more rarely in the 

 floral parts, and form dark colored, dusty spore masses. The 

 spore balls are permanent, composed of an enveloping cortex 

 of tinted sterile cells, enclosing one to several spores, and are 

 of small to medium size. The spores are reddish brown, and 

 of variable shape and size. Figs. 14, 15, 41, 42. 



The sori of this genus look very much like those of Usti- 

 lago. Saccardo in his Sylloge Fungorum describes 34 spe- 

 cies; 12 of these occur in North America, and 4 have been 

 listed from this state. A few of the species are of some 

 economic importance. 



Key to Species of Urocystis. 



I. Spore balls usually with 1 fertile cell, rarely with 2 ; 

 sori forming extended outbreaks on leaves and 



bulbs U. Cepulce. 



II. Spore balls usually with 1 or 2 fertile cells, rarely 

 with 3 or 4. 



A. Sori forming pustular or irregular swellings 



on leaves and stem U. Anemones. 



B. Sori in striae usually on under side of leaf 



sheath U. occulta. 



III. Spore balls usually with 3 to 5 fertile cells, rarely 



with more ; sori oblong in base of flowers 



U. Hy poxy is. 



Urocystis Cepulee Frost. Figs. 14, 42. The sori occur 

 in the leaves and bulbs as isolated pustules or often as more 

 extended areas, and are at first covered by a thin plant mem- 

 brane, but eventually rupture this, disclosing a black, dusty 

 spore mass. The spore balls are ovoid to spherical, small, 

 17-25^ in length, and contain one or rarely two spores. The 

 sterile cells are tinted, ovoid to spherical, small, 4-8^, and 

 rather completely cover the spores. The spores are reddish 

 brown, ovoid to spherical, and chiefly \2-i6fi in length. 



Host and Distr. : Allium Cepa, Green's Farms, June, 



