Poria POLYPORACE^E 361 



1637. P. radula Pers. (from the small teeth, as of a comb, where the 



pores are elongated ; rad-ida, a scraper) a c. 



Sub. a membrane, separable from the matrix. T. shallow, 

 somewhat long in middle, sometimes 2-stratose. Po. tooth-like 

 or comb-like, spinous near the sometimes barren marg., white 

 to biscuit, not turning red. 



Effused. Trunks, branches, fir, oak, hornbeam. Surface with small 

 depressions, sometimes with barren places. Aug. -Jan. 3! in. 



1638. P. vaporaria Cooke (from the warm, moist air, in which it 



luxuriates ; vaporarium, a stove) a b c. 



Sub. a thin, firm, inseparable membrane. P. shallow, large, 

 torn, white to ivory. 



Broadly effused. Moist woods on dead branches, decaying wood, rails, pine, 

 oak, poplar, alder, bamboo, running over dead leaves, on root wounds, 

 barked and injured places, squared timber in buildings ; very common. 

 Jan. -Dec. 4 in. Hartig states this fungus to be as destructive as the 

 " dry-rot " fungus 1680 on living spruce and pine. Ceriomyccs (Ptychogaster) 

 ntbescens is said by Saccardo to be an imperfect state of this. Var. 

 secernibilis Mass., separating from the matrix ; white, then honey-colour ; 

 fir-leaves under moss. 



1639. P. hiberniea Cooke (from the place where first observed, 



Wicklow, Ireland) a. 



Sub. a membrane, not separable from matrix. Po. small, 

 shallow, polygonal, not fimbriato-toothed, white ; marg. narrow, 

 thin, radiato-byssoid. 



At first small, orbicular, then confluent and broadly extended. Decorticated 

 fir branches. Sept. 3^ in. 



1640. P. Gordoniensis Cooke (after the Marchioness of Huntly) a c. 

 Sub. a thin, extremely delicate film, separable from matrix. Po. 



minute, fimbriato-toothed, shining white, becoming faintly 

 yellowish-white ; marg. broad, barren, white. 



Somewhat effused. Fir poles. Feb. 2f in. Closely resembling 1639 in 

 general appearance. 



1641. P. Vaillantii Cooke (after Leon Vaillant, French botanist) a b c. 

 Sub. a thin film, here and there traversed by ribs. Po. rather 



large, shallow, produced here and there in clusters, white or 

 slightly rufescent ; marg. broad, barren, bordered by broad 

 barren radiating growths ending in strands of mycelium. 



Broadly effused. Dead wood. April-Oct. 6 in. 



1642. P. farinella Cooke (from the pulverulent margin ; farina, 



meal) a c. 



Sub. a very delicate, thin film. Po. shallow, with a ragged, 

 toothed appearance ; marg. broad, barren, unwoven, edge 

 pulverulent. 



Broadly and irregularly effused. Old timber, dead wood, beech, oak, pine, 

 cedar. Dec. -Mar. 4^ in. Fugacious to the touch. 



