height from the ground, for the tree is always infected originally 

 through some wound, like a broken branch. I have never noticed it 

 on trunks in woods, but have collected it on trunks in park at Upsala 

 and around Berlin, where the trunks are more liable to injuries. It is 

 not often found on young trees, because the wounds on young, vig- 

 orous trees are more quickly protected by a coating of turpentine. 

 In Europe, in addition to the Scotch pine (Pinus sylvestris), which 

 is its most common host, it occurs also on spruce, larch and the silver 

 fir. In this country on various species of coniferous trees. 



There is a tradition handed down from Fries that the pores do 

 not form distinct strata "sed nulla strata distincta," but that is a 

 mistake. The strata are quite distinct and the plant is a Fomes. 

 The young pores are lined with a yellowish hymenium which is notice- 

 able to the eye. The old pores fill up with tissue the same color as 

 the context, hence might be taken for the context. The young grow- 

 ing tissue is yellow, but it soon changes to brown, and rarely specimens 

 are seen with any part yellow. 



Illustrations. Boudier, t. 161 is so perfect that it is not worth while citing others. Sturm. 

 fasc. 17. t. 50 is very good, however, as to color. Patouillard, page 101, fig. 5, as Xanthocrous. which 

 is supposed to mean "yellow spores," and not very applicable to a plant like this (or several that he 

 includes) with hyaline spores. 



Specimens. Many from Europe and United States and Canada. None from foreign countries. 

 Compare Fomes odoraius in Section 69, page 273. 



The following two plants we consider here from their evident close relationship 

 to Fomes pini. They are classed as Trametes, which they are technically, I believe, 

 for I do not know that they ever form layers of pores. Still I think they are better 

 Fomes, from their woody texture and relationship, but I do not propose to change 

 their names. 



Fig. 610. 



Trametes piceina. 



2 7 6 



