118 THE CHICAGO ACADEMY OF SCIENCES 



On 'dead sticks and small branches lying on the ground in 

 woods. Pileus 1 to 2.5 cm. broad, often conchiform, tapering to a 

 narrow base, white or whitish, marked with a few fuscous con- 

 centric zones and radially grooved or furrowed. Pores pallid, 

 very shallow; spores w^hite, oblong, about 6 x 2 p. 

 Polystictus cinnabarinus Jacq. 



Pileus corky, pubescent, becoming glabrous, scarcely zonate, 

 rugulose, cinnabar-red, fading, within floccose, brighter. 



Pores round, medium sized, entire, of a deeper red than the 

 pileus. 



Not rare on linden, poplar and wild cherry in woods throughout 

 our district. A beautiful fungus, recognized at a distance by its 

 brilliant color. Pileus usually 5 to 8 cm. in breadth, projecting 

 3 to 6 cm.; sometimes centrally attached. Upon a fallen log in 

 woods at Winfield, over a hundred specimens were counted. 

 Polystictus pergamenus Fr. 



Pileus coriaceous-membranaceous, rigid, tomentose, con- 

 centrically sulcate, white. 



Pores seriate, violet or- purple, becoming pale, produced at 

 length in the form of very thin dentate lamellae. 



On trunks and branches; common. Often in imbricated 

 series, extending several meters up the trunk of a dead Populus 

 or Tilia, the individual pilei 2 to 5 cm. broad, projecting 2 or 

 3 cm. Large specimens are usually hirsute and concentrically 

 sulcate; smaller ones even, delicately banded with narrow con- 

 centric lines, and radiate-striate. The plants with the latter 

 characters are usually flabelliform, not more than 2 cm. broad. 

 The species is occasionally proliferous, puiting forth new pilei 

 at the edge of those of the preceding season. The pores when 

 young are a rich violet-purple, but fade to a dingy brown with age. 

 Polystictus versicolor L. (Plate XVII, Fig. 1.) 



Pileus coriaceous, thin, rigid, applanate, depressed behind, 

 even, velvety, shining, variegated with zones of different colors. 



Pores minute, round, acute and lacerated, white, becoming 

 pallid or yellowish. 



On wood of all kinds. Common. When growing on the tops 

 of stumps often forming rosettes 8 to 15 cm. in diameter, the 

 individual pilei 2.5 to 6 cm. broad; context thin, white, coriaceous; 

 pores, including the thick dissepiments, about ^ mm. in diameter. 

 The growing plants are beautifully marked with zones or bands 

 of various shades of gray, red, brown and black. 

 Polystictus bifonnis Kl. 



Whitish or alutaceous; pileus coriaceous, flexible, tough, sub- 

 zonate, with innate radiating fibers, the context fibrillose, con- 

 colorous. 



Pores very large, simple, compound or confluent, round, elon- 

 gated and flexuous, the dissepiments dentate then lacerate, the 

 hymenium finally resolved wholly into teeth. 



