[Vol. 7 

 86 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



cinnamon-buff to hazel; colored conducting organs occasionally present 



47. S. rameale 



20. Fructifications 1-1 1 cm. in diameter, plane, thin, papery, silvery to 

 pale gray and with a silky luster; common on Carpinus, Canada, 



eastern United States to Mexico 48- S. sericeum 



20. Fructifications 3-10 mm. in diameter, pubescent, white. 49. S. pubescens 

 20. S. ochroleucum, an imperfectly known species of Europe, formerly 

 reported in America, belongs here. For description of authentic 

 specimen, see "species imperfectly known." 

 20. Fructifications 2-4 mm. in diameter, conical, attached by the vertex 



and pendant, villose; Cuba 50. S. conicum 



21. Tobacco-colored, velvety-hirsute, becoming glabrous towards the margin 

 and exposing the blackish, horny crust of the intermediate layer; hyme- 



nium pruinose; spores 4-5X2^-3/*; West Indies 51. S. vibrans 



21. Villose, blackening; intermediate layer not bordered by a crust; spores 



9 X4/x," Mexico 52. S. crassum 



21. Velutinous and black above; coloring matter of intermediate layer dis- 

 solved by KHO solution; hymenium ferruginous, radiately ridged; on 



coniferous wood, in northern United States 53. S. radiatum 



22. Cystidia hyaline, non-incrusted, hair-like 23 



22. Cystidia dark, or becoming dark, cylindric, obtuse, distinguishable 

 from colored conducting organs by more or less granule-incrusta- 

 tion; on conifers only 24 



22. Cystidia rough-walled or incrusted, somewhat colored either wholly 

 or under the incrustation, pointed, not resembling conducting 



organs 25 



22. Cystidia incrusted, not at all colored except in S. dnerascens at 



times; paraphyses not noteworthy 26 



22. Cystidia incrusted, not colored; paraphyses noteworthy by color or 



form 27 



23. Cinnamon to bone-brown, hoary; hair-like cystidia very few; spores 



9-10X3-4/*; Washington to New Mexico 54- S. patelliforme 



23. White, villose-tomentose; hymenium bright yellow; hair-like cystidia 



obtuse, 20-25 X 4-6/i, numerous 55. S. ochraceo-jlavum 



24. Coriaceous-spongy, dry, usually resupinate; hymenium pruinose, mul- 

 tizonate; cystidia colored, cylindric, 90-150 X6-8/*; spores 9-13 X 



4-5/*; northern United States 56. S. abietinum 



24. Very thick, felty, concentrically sulcate, drying with odor of anise; 

 cystidia and basidiospores like those of S. abietinum; colored 



imbedded spores often present; Rocky Mountain states 



57. S. rugisporum 



24. Narrowly reflexed, tomentose, Prout's brown; hymenium umber; 

 cystidia and spores as in S. abietinum; Vermont and New York. 



58. S. ambiguum 



25. Vinaceous-lilac when young, becoming snuff-brown; cystidia colored, even, 

 rough-walled or incrusted, 100-200X6-10/*; from North Carolina and 



Ohio southward 59. S. umbrinum 



25. Coriaceous-papery, thin, pliant, tomentose, concentrically sulcate, snuff- 

 brown; hymenium velvety, snuff-brown, not multizonate; cystidia col- 

 ored under the incrustation, conical, 3(K75X 12-25/*; Florida to Brazil. 



. 60. S. papyrinum 



25. With aspect of S. papyrinum but thinner; cystidia 45-60 X 5-1 2/*; hymen- 



ial layer 200/* thick; Jamaica 61. S. Earlei 



25. Coriaceous, tomentose, concentrically sulcate, hair-brown; cystidia slightly 

 colored, roughened above, 50-120X4/*; on conifers, northern United 



States and Canada, and in Rocky Mountains 62. S. Chailletii 



25. Corky, usually resupinate, 1100m thick; hymenium drab, 600/* thick, con- 

 taining innumerable, colored, rough cystidia 20-25 X5-7/*; West Indies. 



63. S. ferreum 



26. Strigose-hairy, concentrically sulcate, buff, weathering gray; hymen- 

 ium pinkish buff to drab, bristling with cystidia 100-150 X12-20m, 

 sometimes brownish at the base; spores 10-12 X6/*. .64- S. cinerascens 

 26. Coriaceous-gelatinous, small, whitish; cystidia 45-90X12-15/*; 



spores 15-20X12-14/*; Jamaica 65. S. magnisporum 



