THE POLYPORACEAE OF WISCONSIN. 105 



Polyporus imbricatus (Bull.), Polyporus anax and P. Berkeleyi Fr. 

 are near relatives, but the sulphur polypore can always be distinguished 

 by the yellow and orange colors. 



Syn. : Polypilus sulpliureus (Fr.) Karst. ; 13, 3, p. 17. 



Laetiporus speciosus (Batarr.) Murr. ; 19, 31, p. 607. 



Polyporus anax Berk (Plate XII, fig. 41). 



Intricately branched; branches passing over into variously formed 

 pileoli, of various sizes, imbricate and confluent, obscurely gray or lead- 

 color, sometimes subtomentose and fibrillose ; pores white, variously 

 formed, generally large and angular ; flesh coriaceous, fragile when dry 

 with the odor of anise. 



Peck (22, 51, p. 299) says that this species is often confused with 

 P. intybaceus, and that the spores of P. intybaceus are described as 

 elliptic or ovoid, while those of P. anax are globose. Mcllvaine 

 (16 p. 482). gives the spores of P. anax as " subelliptic, 7 — 8 microns 

 long. ' ' The fresh spores in our specimens are globose and 5 microns in 

 diameter. 



At the base of an oak stump on a lawn in Madison. Tuft 40 cm. by 

 25 cm. high ; largest pileolus 15 cm. broad, 20 cm. long, 9 mm. thick 

 The pileoli grow densely imbricated, branching out from a common 

 massive stalk, the pilei thin, flabellate, white underneath, dirty-white, 

 grayish-pruinose above ; glabrate or finely tomentose, more or less 

 wrinkled and rough. Substance white, fibrous, leathery, becomes 

 brittle when dry. Pores small, dissepiments thin, white ; spores white, 

 globose, with a single large oil drop. 



This species differs from P. frondosus in its larger and broader pilei 

 and the larger pores and globose spores, and from P. intybaceus in 

 its globose spores and the color of the pores. 



Polyporus frondosus Fries (Plate XII, fig. 43) . 



Very much branched, fibrous, fleshy, rather tough; pileoli very nu- 

 merous, dimidiate, rugose, lobed, intricately recurved, smoky-gray; 

 stems white, growing into each other; pores very small, acute, white 

 round, or torn when in an oblique position. 



Growing in large tufts from 15 to 30 cm. in diameter ; the pileoli 2 to 

 3 cm. broad and 2 to 3 cm. in length ; the thickness varying from 5 to 

 12 mm. ; the tubes about one-third as long as the thickness of the flesh. 



Not as common as P. sulpliureus. Specimens have been found near 



