Murrill: Illustrations of Fungi 



109 



Bjerkandera adusta (Willd.) P. Karst. 

 Poly poms adustus (Willd.) Fries 

 Scorched Polyporus 



Plate 6. Figure 4. X 1 



Pileus cespitose-imbricate, decurrent, sometimes effused, con- 

 chate, fleshy-tough or corky, somewhat flexible when dry, 2-4 X 

 4-8 X 0.2-0.4 cm. ; surface undulate, indistinctly zonate, espe- 

 cially near the margin, finely tomentose or villose, isabelline with 

 slightly darker markings ; margin thin, undulate, sterile, pallid, 

 usually becoming black as though scorched ; context fibrous-corky, 

 white, 1-3.5 mm - thick ; tubes short, 1 mm. or less, smoky-white 

 to blackish within, mouths regular, angular, 5-6 to a mm. ; spores 

 ellipsoid-allantoid, smooth, hyaline, 3-5 X i-5- 2 -5p. 



This is a cosmopolitan species, very abundant everywhere on 

 dead wood and known under many names. Its grayish-black 

 hymenium will distinguish it from most other polypores. 



Tyromyces amorphus (Fries) Murrill 

 Polyporus amorphus Fries 

 Red-tubed Tyromyces 



Plate 6. Figure 5. X 1 



Pileus coriaceous, sessile, efTused-reflexed, or occasionally re- 

 supinate, 0-2 X 1-3 X 0.1-0.3 cm.; surface whitish or cinereous, 

 villose-pubescent or tomentose, marked with narrow concentric 

 zones ; context white, 1-2 mm. thick ; tubes less than 2.5 mm. long, 

 the mouths angular, thin-walled, flesh-colored to orange or brick- 

 red, averaging 2-4 to a mm. ; spores allantoid, hyaline, 4-5 X 

 1-2 ix ; cystidia none ; hyphae not much branched, 3-5 fi. 



This species is rare in most sections, having been found on pine 

 and a few other conifers in the northern United States and 

 southern Canada. The above description is taken from an ar- 

 ticle by Overholts in Mycologia for September, 191 7. In Europe 

 the species has been frequently found on pine and fir and has re- 

 ceived several names, one of which was assigned by Sowerby in 

 1814 and taken up by Romell as Polyporus irregularis (Sow.) 

 Romell. 



