S 4 BA SID 10 M ] r/T TES 



pearance to members of the preceding family, Entylowa and 

 other genera bear httle superficial resemblance to ordinary smuts 

 and for them this name seems a misnomer. The genera may be 

 distinguished by the following synopsis : 



1. Chlamydospores simple ; spores in a terminal cluster of not more than 



twelve. 2. 



Chlamydospores compound, several or many cells united in a mass. 3. 



2. Qilamydospores in dusty masses mostly dark-colored. Tilletia. 

 Chlamydospores formed in small or medium sized often whitish spots 



sunken into the tissues of the host, mosllv light colored. Entyloma.* 



3. All the cells of the mass similar and fertile; (parasitic on Trien/alis). 



TUBURCINIA. 



Outer cells sterile, or the outer fertile with sterile cells within the 

 mass. 4. 



4. Spore cells few; the outer cells sterile. Urocystis. 

 Spore cells numerous ; the outer cells sterile. D assansia. 

 Spore cells numerous ; a single or double layer of outer cells fertile. 5. 



5 Interior of spore-mass filled with closely packed parenchymatous cells. 



Doassansiopsis. 



Interior of spore-mass hollow containing a network of united hyphae ; 



(parasitic on Lenina'). Cornuella. 



Of these genera, Tilletia contains a considerable number of 

 species on various grasses and cereals. {PL 6. f. j.) Among 

 these are T. /r///W forming the bunt or stinking smut in the heads 

 of wheat, T. secalis found on rye, and T. striacfo7-niis forming 

 parallel brown lines on the leaves of various grasses. f 



Entylonia is represented by numerous species on Meiiispei'imim, 

 Physalis, Myosotis, Raminculus and various other plants. 



Urocystis is a typical smut and has a dozen or more American 

 species. {PI. 6.f. 4.) U. agropyi-i forms parallel lines on the 

 leaves of quack grass, U. occulta appears in the stems and leaves 

 of rye, U. anemojies is common in the leaves of Hcpatica, U. 

 cepulae forms the destructive onion smut and there are others. 



* Farlow (Bot. Gaz. 8 : 271-278. 1883) gives a synopsis of the United 

 States of Entyloma then known ; several others have since been described, 

 f We have in this country an Ustilago, a Urocystis and a Tilletia, all pos- 

 sessing this habit. The fungus in each case apparently follows the trend of 

 the parallel venation of the host. 



