84 BASIDIOMYCETES 



pearance to members of the preceding family, Entyloma and 

 other genera bear little 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. Chlamydospores in dusty masses mostly dark-colored. TILLETIA. 

 Chlamydospores formed in small or medium sized often whitish spots 



sunken into the tissues of the host, mostly light colored. ENTYLOMA. -~ 



3. All the cells of the mass similar and fertile; (parasitic on Trientalis). 



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 Levina}. CORNUELLA. 



Of these genera, TiHctia contains a considerable number of 

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

 these are T. tritici forming the bunt or stinking smut in the heads 

 of wheat, T. secalis found on rye, and T. striae/omits forming 

 parallel brown lines on the leaves of various grasses. f 



Entyloma is represented by numerous species on Menispermum, 

 P/iysa/is, Myosotis, Ranunculus and various other plants. 



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

 species. (PL 6.f. 4.} U. agropyri forms' parallel lines on the 

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

 of rye, U. anemones is common in the leaves of Hepatica, U. 

 cepulae forms the destructive onion smut and there are others. 



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

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

 | We have in this country an Uitilago, a Urocyztis and a Tilletia, all pos- 

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

 the parallel venation of the host. 



