2 NORTH AMERICAN FLORA 
Surface pelliculose, often zonate ; plants chiefly trop- 
ical, 
Plants large, more than 5 cm. in diameter; hyme- 
nium flesh-colored. : 
Plants small, 5 cm. or less in diameter; hymenium 
white or pallid. 
32. 
Pileus thin, leathery and more or less flexible, surface 
usually zonate. 
Hymenophore preceded by a cup-shaped sterile body. 22. 
Hymenophore not as above. 
Hymenophore normally pileate ; tubes small and 
nearly always regular. 
Hymenophore semi-resupinate ; tubes large and 
[VoLUME 9 
EARLIELLA. 
33. RIGIDOPORUS. 
PORONIDULUS. 
23. CORIOLUS. 
irregular. 24; CORIOLELLUS. 
Hymenophore stipitate. , 
Stipe compound. 40. GRIFOLA. 
Stipe simple. 
Plants fleshy, terrestrial. 39. SCUTIGER. 
Plants tough, epixylous. 
Tubes large, hexagonal and radially elongate from the first. 35. HEKAGONA. 
Tubes not as above. 
Pileus inverted, erumpent from lenticels. 34, PORODISCULUS. 
Pileus erect or lateral, not erumpent. 
Context duplex, spongy above, woody below. 38. ABORTIPORUS. 
Context homogeneous, firm. 
Surface zonate. 36. MICROPORELLUS. 
Surface azonate. 37. POLYPORUS. 
Context bright-colored ; yellow or red. 
Hymenophore sessile or subsessile. 
Pores red. 
Context soft and spongy. 41, AURANTIPORELLUS. 
Context firm. 
Tubes unchanged on drying. : 7 
Tubes fragile ; surface anoderm. 42, PYCNOPORELLUS. 
Tubes firm and regular ; surface pelliculose. 43. PYCNOPORUS. 
Tubes orange-colored, becoming dark and resinous on drying. 44. 
Pores yellow. 
AURANTIPORUS. 
Context thin ; plants small. 45, FLAVIPORELLUS. 
Context thick ; plants very large. 46. LAETIPORUS. 
Hymenophore distinctly stipitate ; context yellow. 47. PHAEOLOPSIS. 
Context brown. 
Hymenophore sessile. 
Spores hyaline. 
Context light-brown, 
Context at first fleshy, becoming slightly corky. 53. ISCHNODERMA. 
Context tough from the first. 
Surface encrusted. 54. ANTRODIA. 
Surface not encrusted. 
Surface glabrous or nearly so. 
Hymenium alveolate. 55. FAVOLUS. 
Hymenium normally poroid. 52. HAPALOPILUS. 
Surface distinctly hairy. 
Tubes small and regular. 49. CORIOLOPSIS. 
Tubes large and irregular. 50. FUNALIA. 
Context dark-brown. 
Context duplex, mostly of intricately woven black hairs. 51. TRICHAPTUM. 
Context simple. 
Context friable. 61, PHAEOLUS. 
Context tough. 
Tubes yellow. 56. FLAVIPORUS. 
Tubes brown, rarely greenish. 
Tubes entire. 
Surface heavily bearded. 57. POGONOMYCES. 
Surface not bearded. 49, CoRIOLOPSIS. 
Tubes soon splitting into teeth. 48. CERRENELLA. 
Tubes black. 58. NIGROPORUS. 
Spores brown. 
Hymenophore thin, dry, multizonate. 59, CYCLOPORELLUS, 
Hymenophore not as above. 60. INoNoTUS. 
Hymenophore stipitate. , 
Spores hyaline. 61. PHAEOLUS. 
Spores brown. 
Pileus inverted, pendant. 62. COLTRICIELLA, 
Pileus erect, stipe central. 63. COLTRICIA, 
Tribe 3. FoMITEAE. Hymenophore large, woody, perennial, rarely small or annual ; surface 
anoderm or encrusted, usually sulcate, sometimes varnished : context punky or woody, variously 
colored ; tubes cylindrical, usually thick-walled : spores rounded, smooth or verrucose hyaline 
or brown ; cystidia frequently present: surface of pileus conidium-bearing in a few species : 
stipe rarely present, the hymenophore usually being sufficiently elevated by its host. Annual 
