110 Murri_L: PoLypoRACEAE OF NorTH AMERICA 
Io. 
tr. 
r2. 
13. 
43 
15. 
16, 
17. 
Tubes long, over 0.5 cm. each season, walls thin, pores large, 3 to a mm. 9. 
Tubes very short, 0.1~0.5 cm. long each season, walls equalling tubes in thick- 
ness, pores small, 5 toa mm., spores globose, 4-5 u, cystidia none; growing 
abundantly on Rodinia. 6. P. Robiniae. 
. Spores globose, 3-4“ in diameter, cystidia present ; pileus blackish, very rimose, 
hymenium convex, margin truncate, at length hoary. 7. P. praerimosus. 
Spores ellipsoidal, 7 9 /, cystidia none ; pileus dark brown, hymenium concave, 
margin not hoary. 8. P. Underwoodit. 
Older pores visible in projecting annual layers, tubes 3-4 to a mm., thin-walled; 
pileus deeply furrowed, not rimose. g. P. juniperinus. 
Older pores not externally visible, tubes 1-2 to a mm., thicker walled; surface 
very rimose. 10. P. Larlet. 
Spores hyaline. 13; 
Spores yellowish brown. th; 
Cystidia abundant, pointed, dark brown; pileus thin, woody, rigid, tubes short, 
5 toa mm. 11, P. conchatus. 
Cystidia none. 13. 
Context thick, woody, honey-yellow, surface encrusted, margin blunt. 
12. P. Haematoxyli. 
Context thin, punky, darker brown, surface without a crust, margin sharp. 14. 
Pileus 10-25 cm. broad, covered with narrow shallow furrows, margin undulate 
or lobed, pores minute, 8~9 to a mm. 13. P. Langloisit. 
Pileus smaller, deeply sulcate, pores larger, 6 to a mm. ; growing on species of 
Ribes, very rarely on other shrubs. 14. P. Ribis. 
Dissepiments thick, hymenium concolorous with context. 16, 
Dissepiments thin, hymenium darker than context. 17- 
Pileus very rimose, cystidia present ; tubes fulvous, 7 to a mm., spores globose, 
3-5-5 m, cystidia 17-35 wu. 15. P. Yucatanensts. 
Pileus scarcely rimose, encrusted, becoming smooth, cystidia absent ; margin 
undulate, tubes 8 toa mm., spores globose. 16. P. senex. 
Pileus hard and heavy, surface sulcate, ‘brown, clothed with lime-white hair, 
spores 3.5 4, spines 40-60 yu, 17. P. linteus. 
Upper layers of pileus dead, projecting 1-2 cm. beyond the lower, tube strata 
separated by thin layers of context, tubes 7 to a mm., spores 5-7 4, cystidia 
absent. Py. See ad Jamaicensis. 
1. Pyropolyporus igniarius (L.) | 
Boletus igniarius L. Sp. Pl. 1176. 1753; Tourn. Inst. 1: 
562, Ws 5 FAY Ag TO. 
Polyporus igniarius Fries, Syst, ¥:747%, ter, 
Fomes igniarius Gill. Champ. Fr. 1: 687. 1878; pl. 156. 
Phellinus igniarius Quél. Ench. 172. 1886. 
een etinctieetieemenemmiie 
