14 



that in the pine-barren bellwort we have a distinct species, which 

 should be called Uvularia nitida, and which is much more closely- 

 related to U. piiberula than it is to U. sessilifolia. The preceding 

 table will show the chief differences between the three species. 

 From the above it may be noted that the differences between 

 U. nitida and U. sessilifolia are very pronounced, while those be- 

 tween U. nitida and U. piiberiUa are much more slight. This last- 

 named species is variable, and incomplete specimens from the 

 South, in the Columbia University herbarium, show a close 

 approach to U. vitida. The species, however, as a rule, seem 

 decidedly distinct, when represented by good specimens. The 

 style character is apparently especially constant, although it may 

 depend to some extent on the age of the flowers. As between 

 U. sessilifolia and U. puberula this distinction is well shown in the 

 Illustrated Flora {Jigs. g88, gScf). 

 New York City. 



A KEY TO THE WHITE AND BRIGHT-COLORED 



SESSILE POLYPOREAE OF TEMPERATE 



NORTH AMERICA — I 



By William A. Murrill 



Key to the Genera 

 Context white. 



Tubes hexagonal, arranged in radiating rows, context thin. 



A. Hexagona 

 Tubes mostly shallow, marginal and obsolete, hymenium hydnoid or irpiciform 



at a very early stage. B. Irpiciporus 



Tubes normally poroid, sometimes irpiciform from the rupture of the dissepi- 

 ments at maturity. 

 Hymenium at length separating very smoothly from the context. 



C. Piptoporus 

 Hymenium not separating as above. 



Pileus very soft, spongy and elastic throughout. 



D. Spongiporus 

 Pileus more or less firm, flexible or rigid. 



Context duplex, spongy above, firm below, surface sodden and 



bibulous. E. Spongipellis 



Context not duplex as above. 



Pileus fleshy-tough to woody and rigid. 

 Surface anoderm, rarely zonate. 



Hymenium more or less smoke-colored at maturity. 

 F. Bjerkandera 



