20 NATURAL HISTORY BULLETIN. 



preceding although sometimes showing traces of an interven- 

 ing hymenophore as in No. i. The context is brilHantly 

 ferruginous, radiate in all directions with exceedingly hard, 

 black, corneous fibres in substance similar to the crust. The 

 lower surface is usually white, pruinose, sometimes sulphur- 

 yellow. N. A. F. 8oi. 



6. FOMES ULMARIUS FvicS. 



Pileus expanded, sessile, thick, lignose-suberose, very hard, 

 white the first year, later blackish with a yellowish rim, within 

 whitish, pores small, even, stratose, yellowish. 



This species seems to be confined to species of Ulimis; here 

 on U. americana only, forming singular discoid lumps, more 

 or less irregular, in outline. There is no internal evidence of 

 stratification, the pores seemingly continuous from the first, 

 but on the outside are deep sulcations each bounded by the 

 thin reflexed outer edge of a year's increment. The growth 

 is apparently very slow. Specimens showing eleven such 

 sulcations are no more than three cm thick. The pores at 

 first whitish become with time brownish or rusty. It seems 

 probable that F. fraxinophilus Pk. is the same thing. 



7. FoMEs coNGLOBATUs Berkeley. 



Pilei suberose, erumpent, closely imbricate, forming a globose 

 mass, arcuate, rugose, fusco-purplish the margin pallid, some- 

 what laccate behind; the hymenium brownish; the pores 

 punctiform with obtuse dissepiments. 



A very peculiar species, not common, forming obconical 

 nodose masses on the sides of standing trees, Vv'hich in series 

 sometimes spread for several meters. The narrow deflexed 

 pileoli spring from a well developed central core or trunk, are 

 very numerous and become obsolescent below. At first 

 purple with pallid margin and ashen hymenium, the pileoli 

 wi h age become blackish without, ferruginous, concolorous 

 with the trunk beneath, and lose many of their peculiar 

 external characteristics. Diameter 4-6 cm. 



