594 MurriLL: PoLypoRACEAE OF NorTH AMERICA 
very deeply colored, while others are so pale as to appear almost 
hyaline, especially when not fully matured. 
The largest species is /. hirsutus, sometimes over 30 cm, in 
diameter, while the smallest, /, pusz//us, is rarely over two or three 
millimeters across. As regards the distribution of our species, two, 
I. hirsutus and J. radiatus, occur in Europe and in temperate North 
America; three others, /. perplexus, [. dryophilus and I. amplec- 
fens, appear to be confined to temperate regions of North America; 
while the remaining six are known only from certain localities in 
tropical America. 
Synopsis of the North American species 
1. Spores deep brown in color. sg 
Spores faintly tinted with brown. 5 
2. Surface of pileus hirsute, tubes luteous, margin obtuse ; plants of large size and two 
ntimeters or more in thickness. . L. hirsutus. 
Stace of pileus conspicuously OMe margin acute ; plants of medium size and 
one centimeter or less in thic ese 
Surface of pileus glabrous or Eee tomentose. 
3. Pileus 8 cm. or more in width, rigid, ferruginous throughout, margin rather obtuse. 
; aod, dryophilus. 
Pileus 5 cm. or less in width. . 
= 
Surface of pileus very rimose, tubes 2 cm. long. 4. 1. texanus. 
Surface of pileus rugulose and zonate, but not rimose, tubes 1 cm. long. 
5. 1. jamaicensts. 
5. Pores scarcely visible to the unaided eye. 
Pores conspicuous. 7- 
6. Pileus thick, azonate, margin obtuse, hymenium dull. Ge corre 
Pileus thin, zonate, margin very sharp, hymenium glistening. 7, L. Wilsonu. 
7. Plants minute, only a few millimeters across, erumpent from lenticels of dead twigs. 
8. J. pusillus. 
Plants of medium size. 8. 
% 
Surface soft, anoderm, sporophores growing on living shrubs, often encircling the 
smaller branches. 9 
Surface hard, becoming encrusted, sporophores found on decaying wood. 
_ Lt. radiatus. 
9. Hymenium very concave, umbrinous, margin sharp and depressed. 10 ie amplectens. 
Hymenium plane or nearly so, becoming almost black, margin — blunt and not 
depressed. . 1. fruticum. 
1. Inonotus hirsutus (Scop.) 
Boletus hirsutus Scop. Fl. Carn. ed. 2. 2: 468. 1772. 
Boletus spongiosus Lightf. Fl. Scot. 1033. 1777. 
Boletus hispidus Bull. Herb. Fr. p/. 210. 1784. pl. 493. 179}: 
