POLYPORUS 377 



The fruit of the fungus is not formed until the tree has been 

 dead for some considerable time. 



Perennial, overlapping, dimidiate, 4-6 in. across, reddish- 

 brown, margin thickened, yellowish, marked with concentric, 

 darker zones, slightly sulcate and radially striate, silky; hymen- 

 ium orange, then brownish, pores minute. Flesh whitish, zoned. 



Infection by mycelium in the ground which extends from 

 old stumps on which the fungus is often abundant. Such 

 stumps should be removed. 



Petch, Roy. Bot. Gard., Ceylo/i, 3, Circular No. 17 (1906). 

 Ridley, Agr. Bull. Straits Sett., 3, p. 174. 



Fomes Hartigii (Allesch.). This fungus is very closely 

 allied to Fomes igniarius ; however, it is parasitic on conifers 

 and not on broad-leaved trees. It was described by Hartig 

 under the name of Polyporus fulvus. It attacks more especi- 

 ally the silver fir, entering through wounds made by Peri- 

 dermium elatinum, and causes a white rot of the wood. It 

 has also occurred on spruce. The mycelium penetrates both 

 sap-wood and heart-wood, and spreads at a great pace in the 

 bark, and produces sporophores at various points. Wood 

 when first attacked by the mycelium becomes pale yellow, 

 the injured area being bounded by a dark brown line. The 

 mycelium is brown or yellowish-brown. 



The sporophore is hard, woody, persistent, subglobose, or 

 forming irregular nodules, with the hymenium running down 

 the tree for some distance. Pileus yellowish-brown, covered 

 with short, harsh hairs, becoming greyish, smooth, and more 

 or less concentrically grooved ; hymenium greyish-brown or 

 cinnamon, pores rounded, very minute, and not very pro- 

 nounced. Spores hyaline. Flesh of pileus fawn-colour. 



Fomes fulvus (Fries.) occurs on trunks of poplar and other 

 trees; it is not common in this country. 



Very hard, convex both above and below, attacked by a 

 broad base, triangular in section; pileus even, downy when 

 young, tawny, then greyish, flesh rusty ; tubes short, not 

 distinctly stratose, pores minute, cinnamon, with a greyish- 

 yellow bloom. 



POLYPORUS (Micheli) 



Annual. Pileus fleshy, rather soft, not grooved nor colour- 

 zoned, flesh composed of fibres, often radiating. Pores con- 

 sisting of a single layer (not stratose). 



