114 THE CHICAGO ACADEMY OF SCIENCES 



Stipes thick and canescent, white; pores large, unequal, angu- 

 lar, white; spores white, subellipsoid, 7 to 8 /*. 



A single plant was found by Mr. Bertolet at the base of an oak 

 tree at South Chicago, September, 1902. It consists of a mass 

 of branches and pileoli 2.5 dm. in diameter and 1.5 dm. in height. 

 The flesh is white; the pores in many portions of the plant 

 labyrinthine. The fuliginous-gray overlapping pileoli are in 

 many places thickly jjowdered by the white spores. These latter 

 are smaller than the dimensions given by Mr. Berkeley, measuring 

 only 4 to 5 /A. The species is said to attain a diameter of 5 dm. 

 It is evidently rare here, as so conspicuous a plant could scarcely 

 escape the notice of collectors. 



A single specimen was collected by Dr. Watson at LaGrange, 

 September, 1903. 



Polyporus nidulans Fr. 



Pileus somewhat pale yellowish, of the same color internally, 

 fleshy, very soft, somewhat pulvinate, villous, becoming even, 

 zoneless. 



Pores elongated, of medium size, unequal, angular, tawny 

 brick-color. Fragrant when dry. 



On rotten wood in woods. Frequent. Pileus dimidiate, 2.5 

 to 9 cm. broad, 12 to 25 mm. thick. Specimens collected by Dr. 

 Watson, at Elmhurst, have the pileus not hirsute, but finely 

 pubescent near the margin; deep flesh-color. The pores are angu- 

 lar, very unequal in size and shape. According to Saccardo P. 

 niveus Fr. is a synonym. 



Polyporus resinosus Schrad. (Plate XV, Fig. 1.) 



Pileus fleshy then corky, flocculose-pruinate, reddish-brown, 

 the cuticle adnate, rigid, rivulose, resinaceous; within azonate, 

 pallid. 



Pores minute, equal, pallid. 



On decaying prostrate trunks of Tilia americana, in moist 

 woods, River Forest and Glen Ellyn. Also on decayed trunks of 

 apple trees in gardens and orchards. In our specimens the margin 

 of the pileus is usually strongly depressed. When mature, the 

 surface becomes much wrinkled, and often marked with blackish 

 bands or zones and the context becomes variously shaded, wood- 

 colored and ochraceous. Specimens 2 to 2.5 dm. broad are not 

 uncommon. Ischnoderma fuliginosum (Scop.) Murrill, in N. A. 

 Fl. 9: 32. 



Polyporus gilvus Schw. (Plate XV, Fig. 2.) 



Pileus corky-woody, hard, effused-reflexed, imbricate and con- 

 crescent, subtomentose, thin, scabrous and uneven, reddish- 

 yellow, then subferruginous, the margin acute. 



Pores minute, round, entire, brownish-ferruginous. 



Very common on trunks of living and dead Quercus, and fre- 

 quent on other trees. Occasionally the plant is wholly resupinate. 



