182 THE POLYPORACEAE OF WISCONSIN. 



PLATE XIII. 

 Polyporus. 



Fig. 44. Polyporus graveolens Schw. a, surface of pileoli; 6, section. On 



oak. Mauston. 

 Fig. 45. Polyporus volvatus Peck, a, surface of pileus and mycelial plug 



from hole of bark borer; 6, section; c, lower surface of "volva," 



showing opening; d, pores. Hazelhurst, August. 

 Fig. 46. Polyporus ~betulinus Fr. a, pores; fc, section. On birch. Bangor, 



August. 



Fig. 47. Polyporus brumalis Fr. a, pilei; &, pores. Bangor, October. 

 Fig. 48. Polyporus lentus Berk. Photograph from dried specimen. The stipe 



was straight when collected. Dodge. Blue Mounds, June. 

 Fig. 49. Polyporus circinatus Fr. a, section; &, pores. Dodge. Algoma. 



