POLYPORUS. 187 



intervention of any subiculum (except in the case of P. medullapanis and P. Polyporus. 

 mucidus). 



The species of this group must be cautiously examined. For many species 

 of Apodes are found in a resupinate state when growing in a horizontal situa- 

 tion, e.g., P. mollis, destructor, croceus, nidulans, amorphus, adustus, igniarius, 

 radiatus, conchatus, abietinus. 



In a horizontal situation the pores in this group are straight, in a vertical 

 one oblique, nay gaping at one side. 



* Pores fuscous or blackish. 



** Pores ferruginous or cinnamon. 

 * Pores purple or violaceous. 



**** Pores red. 

 '*** Pores yellowish. Compare P. vulgaris. 



****** Pores white then changing colour. 



******* Pores persistently white, minute, crowded, in a plane situation 

 round, equal. 



******** Pores persistently white, unequal, angular, close to one another, 

 commonly rather large. 



********* Pores white, superficial, distant, punctiform. 



I. MESOPUS. Pileus entire, c. 



A. Carnosi. 

 * Pileus unpolished. 



1. P. leucomelas Fr. Pileus 5-7.5 cent. (2-3 in.) broad, 

 black -fuliginous, fleshy, somewhat fragile, irregularly shaped, 

 slightly silky-squamulose ; flesh white, reddish when broken. 

 Stem 2.5-7.5 cent. (1-3 in.) long, stout, unequal, somewhat 

 tomentose, of the same colour as the pileus. Pores rather large, 

 unequal, cinereous, whitish. 



The stem is sometimes curt, 2.5 cent, (i in.) and tuberous, sometimes 5-7.5 

 cent. (2-3 in.) and equal, also becoming black internally. The pores become 

 black in dried specimens. 



In fir wood. Rothiemurchus. Sept. 



Name Aeuxd?, white ; /ue'Aa?, black. From the colours. Fr. Hym. Eur. p. 

 524. Icon. t. 179. /. i. B. & Br. n. 1682. -S. Mycol. Scot. n. 691. Ptrs. 

 Syn. p. 515. 



** Pileus polished, smooth. 

 No British species. 



B. Lenti. Pileus fleshy-pliant then coriaceous, c. 

 * Pileus unpolished, scaly or villous. 



2. P. lentus Berk. Pileus 4 cent, (i^ in-) broad, reddish- 

 brown at length ochraceous, fleshy, but tough, umbilicate, 

 minutely scaly, especially at first. Stem 12 mm.-2.5 cent. 

 (Yz-\ in.) long, 9 mm. (ft in.) thick, rather slender, incurved, 



