PORES WITH THIN WALLS. 



species is about twenty years old. These layers are 5-7 mm. thick 

 at first and quite distinct, but are reduced both in thickness and area 

 in later years, forming a peculiarly shaped, contracted pileus. This 

 effect in this one specimen may be due to exhaustion of the food 

 supply as the plant grows older. 



SECTION 74. PONDEROSUS-FOMES-GAXODERMUS. 



Pores hard, heavy, minute, with thick walls (Fig. 601). Spores smooth or 

 punctate. 



FOMES SUBTORNATUS. Pileus applanate, with a hard, 

 rigid, black crust with brown surface. Context dark brown (bay 

 brown). Pores very minute, hard, rigid, heavy, with thick walls. 

 Mouths fuliginous. Spores 6 x 10, smooth, truncate. 



This form was first clearly distinguished in Bresadola's work on 

 Philippine fungi. It has a hard, rigid crust and dark, minute, hard, 

 rigid pores, similar to the pores of Polyporus fornicatus and Polyporus 

 mastoporus. The pore mouths are concolorous with the tissue. The 

 young specimens sometimes show a slight black, laccate exudation, 

 similar to that of Fomes nigro-laccatus. Originally it was described 

 as having a short, lateral stipe, but specimens do not show it. The 

 species is distinguished from the other Fomes of this section by the 

 color of its pores and pore mouths, which are concolorous with the 

 pore tissue. 



SPECIMENS. Philippines, E. D. Merrill (six collections); Madagascar, Henri Perrier de la 

 Bathie (not typical); Java, J. P. Mousset; New Zealand, S. Duncan. 



Compare piceus. 



FOMES PSEUDOAUSTRALIS. Pileus thick, applanate, with 

 a thick, hard, black, shiny, sulcate crust. Pores very minute, hard, 

 heavy, compact, in many layers, almost reaching the crust. Context 

 and pore tissue dark brown (bay brown). Spores 6x10, smooth, 

 punctate. 



This is based on a Philippine collection, Curran 13748. It was 

 referred to Fomes australis, but on comparison is quite different from 

 the type of Fomes australis at Kew. The hard, heavy pores are sim- 

 ilar to Fomes subtornatus. This answers the description of Fomes 

 australis better than the type, but it is quite certain that it never 

 grew in Europe, where Fries states australis occurs. This is probably 

 the same as Fomes piceus, of which no authentic specimen is known 

 to me. 



Compare piceus. 



FOMES POLYZONUS. Pileus applanate, with a smooth, hard, 

 pale crust. Context dark brown (bay brown), with narrow, regular 

 zones \y 2 mm. wide, and also with black layers of resinous tissue 



269 



