1920] 



BURT — THELEPHORACEAE OF NORTH AMERICA. XII 85 



13. Not having gloeocystidia, vesicular organs, nor colored conducting organs . . 14 

 14. Hymenium lacking cystidia and paraphyses of noteworthy form or 



color 18 



14. Cystidia present, incrusted or without incrustation and hair-like, 



hyaUne, or colored 22 



14. Paraphyses noteworthy by bottle-brush form, branching, or color. 

 For species having cystidia in addition to noteworthy paraphyses, 



see 27 28 



15. Coriaceous, dense, tawny, zonate, not sulcate, thin, 5-10 mm. in diameter; 



in Jamaica 29. S. caespitosum 



15. Soft, spongy, snuff-brown to bister, concentrically sulcate, reflexed 1-4 cm.; 



of wide range SO. S. fuscum 



15. Coriaceous-fleshy, bursting out from the bark, wart-Uke, peltate, vinaceous- 



brown, 2-4 mm. in diameter; no cystidia; on poplar 31. S. rufum 



15. Coriaceous-cartilaginous, shield-shaped, wood-brown, 1-4 mm. in diameter; 



cystidia present ; on pine 32. S. Pini 



16. Coriaceous-soft, tomentose, lacking cystidia 33. S. purpureum 



16. Coriaceous-soft, tomentose, often with hairs becoming agglutinate 



into a rugose surface; hair-like cystidia present. .34- S. rugosiusculum 

 16. Corky, usually resupinate, sometimes reflexed and with the upper side 



a horny crust; vesicular bodies very numerous 35. S. Murrayi 



16. Stony hard throughout, the cut surface with a horn-like luster, 1-5 



mm. thick; vesicular bodies few; in Mexico and Jamaica . .36. S. saxitas 

 17. Exuding a yellow milk, conducting organs of pale color; narrowly reflexed, 

 tomentose; on Liquidambar and Carpinus in North Carolina and 



Alabama 37. S. styracifluum 



17. Milk red, conducting organs dark, numerous; fructifications cespitose- 

 imbricated, viUose to hirsute, tobacco-colored; on oak, Canada to 



Alabama and westward 38. S. gausapatum 



17. Milk red, conducting organs few; fructifications tomentose, concentrically 



sulcate, not cespitose; Florida to Brazil. 39. S. australe 



17. Milk red, conducting organs dark, numerous; fructifications narrowly 

 reflexed; hymenium multizonate; on frondose species, Newfoundland to 



North Carolina 40. S. rugosum 



17. Milk red, conducting organs numerous; on pine, spruce, and hemlock, 



Canada to Pennsylvania and westward to the Pacific coast. 41 ■ S. sanguinolentum 

 18. Fructifications sulphur-colored, fading to cartridge-buff; inter- 

 mediate layer not bordered by a golden, denser zone; Georgia to 



Brazil, and in Germany 42- S. sulphtiratum 



18. Fructifications at first some shade of buff by reason of the hairy 

 covering, becoming grayish with age, and at length often zonate and 

 shining where disappearance of the hairy covering reveals the 



hardened, colored surface of the intermediate layer 19 



18. Fructifications white or whitish to cartridge-buff 20 



18. Fructifications snuff-brown or black above 21 



19. Effuso-reflexed, cream-buff at first, strigose-hirsute ; hymenium warm buff, 

 sometimes pale smoke-gray; intermediate layer bordered by a narrow 

 golden zone; colored conducting organs rarely present in the hymenium; 

 Newfoundland to South Carolina and westward to the Pacific coast. 



43. S. hirsutum 



19. Effuso-reflexed at first, becoming umbonate-sessile, tomentose, sometimes 

 with the tomentum becoming torn into narrow concentric bands nnd 

 showing the bared surface chestnut in the furrows; margin not normally 

 lobate; fructifications 2-7 cm. in diameter; common throughout North 



America 44- S. fasciatum 



19. Wedge-shaped to umbonate-sessile, with a thinner covering of tomentum 

 than S. fasciatum, becoming more bared and zonate than the latter, thinner 

 and flexible, and with the margin normally cut into 2 or 3 large lobes; 



New York and Wisconsin southward to Brazil 45- S. lobatum 



19. Covering of silky, villous fascicles arranged radially, becoming glabrous, 

 shining, and radially ridged, not lobed nor folded together laterally, nor 



crisped; Florida to Dutch Guiana 46- S. versicolor 



19. Pilei 2-10 mm. long and broad, crowded together and folded or crisped, 

 strigose-hairy towards the base; marginal portion shining and zoned, 



