82 ^ NINTH REPORT. 



jerruginea) , birch (Betula lenta), maple {Acer saccharum) ." Murrill*, avIio 

 considers Fomes pinicola Fr., F. ungulatus Schaeff., and F. marginatus Fr. as 

 one species under the name of Fomes ungulatus Schaeff., says that it is found 

 abundantly upon conifers and rarely upon deciduous trees standing near its 

 usual hosts, and that beech, elm, maple, and birch are known to have been 

 attacked by it in American and European forests where conifers abound. 



From the observations that have been made it is evident that Fomes pini- 

 cola Fr. is a very common fungus on the conifert-us trees of the state. 



It sometimes attacks Hard Maple, Beech, Yellow and White Birch, and 

 Balsam Poplar also. 



Upon Presque Isle it has so adapted itself as to become epidemic on the 

 Balsam Poplar. 



The fruiting bodies vary in shape depending largely upon the rate of growth, 

 and the colors of the pileus are different at different periods in the develop- 

 ment of the same fruiting bod^^ 



In some instances on deciduous trees the pileus may be entirely destitute 

 of red and yellow colors. 



Ann Arbor, Mich. 



iMurrill, W. A., Polyporaceae of North America, Torr. Bull. No. 30, 1903, p. 228. 



