584 POLYPORUS 



1931. P. betulinus (Bull.) Fr. Grev. Scot. Crypt. Fl. t. 229. 



Betula, birch. 



P. 7-30 cm., pale, becoming brownish with age and often mottled, 

 roundish, or reniform, attached by a narrow, bossy base which some- 

 times forms a short stalk; pellicle smooth, thin, separating; margin 

 very obtuse, sterile. Tubes white, 2-8 mm. long, often separating; 

 orifice of pores white, becoming darker, minute, round. Flesh white, 

 soft, then corky. Spores white, oblong, 5-7 x 2/x, often curved. 

 Birch, rarely beech. Common, (v.v.) 



1932. P. quercinus (Schrad.) Fr. Boud. Icon. t. 154. Quercus, oak. 

 P. 7-15 x 5-12 cm., pale tan, or tinged with red, and becoming reddish 



when bruised or with age, tongue-shaped, convexo-plane, narrowed 

 behind into a thick horizontal stem, at first floccoso-granular, or 

 minutely squamulose, becoming smooth; margin obtuse, sometimes 

 lobed. Tubes whitish, 4 mm. long; orifice of pores whitish, or yellowish, 

 becoming reddish when bruised, and finally concolorous, minute, round. 

 Flesh whitish, lemon yellow under the cuticle and at the base of the tubes, 

 often pinkish elsewhere when young, especially in the stem, 1-5 2-5 cm. 

 thick, floccose, soft, then hardened. Spores white, often yellowish, 

 oblong, 10-12 x 4-5/Li, slightly granular inside. Taste very bitter. 

 Oaks, and oak logs. May Dec. Rare, (v.v.) 



1933. P. dryadeus (Pers.) Fr. Bull. Hist. Champ. Fr. t. 458. fy>0<?, oak. 

 P. 7 30 cm., yellowish, then ferruginous and becoming brown, dimi- 

 diate, horizontal, pulvinate, imbricate, cuticle thin, soft, pruinose, 

 rugged, becoming even, smooth; margin often exuding watery drops. 

 Tubes ferruginous, 10-30 mm. long; orifice of pores whitish, round, 

 small. Flesh ferruginous, subzoned, soft, becoming corky, thick. 

 Spores pale ferruginous in the mass, yellowish under the microscope, 

 globose, 6-8 x 6-7 (JL, 1-guttulate. Cystidia "sparse, straight, 40 x 8/z." 

 Lloyd. Taste acid, the drops very astringent from the tannic acid 

 they contain. At the base of oaks. May Dec. Common, (v.v .) 



VII. P. villose, velvety, or strigose, without a cuticle. Flesh coloured, 

 moist, then firm, and fragile. Tubes heterogeneous, separable, 

 coloured. Spores white, or coloured. Cystidia coloured, or wanting. 

 Annual. Growing on wood. 



1934. P. hispidus (Bull.) Fr. Boud. Icon. t. 158. Hispidus, shaggy. 

 P. 10-30 cm., yellowish, then ferruginous and finally blackish, 



dimidiate, pulvinate, thick, very hispid, shaggy. Tubes ferruginous, 

 2-3 cm. long; orifice of pores yellowish, becoming concolorous, small, 

 round, becoming torn, often exuding watery drops. Flesh ferruginous, 

 2-5-10 cm. thick, spongy, fibrous, becoming dry and fragile. Spores 

 brown, subglobose, 9-10 x 7-8/x, often apiculate, 1-multi-guttulate. 



