Mukkill: Polvporaceae of North America 35 



The stipe is long and slender, centrally attached and somewhat 

 hairy at the base. The pileus is umbilicate with involute margin 

 resembling a minute species of OnipJialia in shape. In general 

 appearance the plant resembles P. TricJiolonia, but the margin is 

 without cilia and the pores are alveolar. 



10. PoLYPORUS discoideus B. & C. Jour. Linn. Soc. lO : 



303. 1868 

 This species was collected by Wright in Cuba. It is rather 

 larger than most of the members of the genus, but resembles 

 them closely in habit and structure. Its nearest ally is perhaps 

 P. virgatns. Being large, it is rather fleshy, the context becoming 

 soft, corky and elastic when dry. The tubes are rather large, at 

 length sinuose, and become collapsed on drying, indicating a soft 

 condition when fresh. 



11. Poi.vpoRUS phaeoxanthus B. & Mont. Sylloge Crypt. 



154. 1856 

 This rare species was collected at Columbus, Ohio, by SuUi- 

 vant. It grew on fallen oak wood. The type at Paris is in frag- 

 ments, but these are well preserved. The character by which the 

 species is at once recognized is the deep yellow' color of the con- 

 text. The pileus is convex, reddish-brown, glabrous, scarcely a 

 millimeter thick and about two centimeters broad ; the stipe cen- 

 tral and concolorous, the tubes minute and remote from the stipe. 



12. PoLYPORUS Columbiensis Berk. Lond. Jour. Bot. i : 



454. 1842 



This is one of the thinnest species of the family, resembling a 

 brown cuticle stripped from some fruit having a smooth, waxy, 

 polished coat. It is orbicular in shape with a dark central stipe 

 and small decurrent tubes. The type was sent to Berkeley from 

 the Columbia River region ot South Carolina. There is also in 

 the Berkeley herbarium a specimen from Chicalahi, Mexico, bear- 

 ing the same name, which may be the same species. 



13. PoLYPORUS OBOLUS Ell. & Macbr. Bull. Iowa Univ. Lab. 

 Nat. Hist. 4: 68. 1896 



A small plant with very thin partially translucent pileus, brown 

 central stipe and exceedingly minute pores. Pileus orbicular, 



