TROPICAL POLYPORES 95 



Found once on Melicocca in Jamaica and once at Santa Isabel, 

 Porto Rico. 



9. AMAURODERMA BRITTONII Murrill 



Pileus circular in outline, nearly plane, rather soft when fresh, 

 becoming rigid and fragile when dry, over 30 cm. broad in a 

 dried condition and probably 50 cm. when fresh; surface un- 

 even, somewhat sulcate, castaneous to fuliginous, pelliculose, 

 pruinose, opaque, becoming very much wrinkled and uneven on 

 drying; context punky when dry, avellaneous, homogeneous, 

 bounded above and below by a thin, dark layer about 2 mm. 

 thick; hymenium grayish when fresh, becoming brownish on dry- 

 ing and blackening where bruised ; tubes minute, irregular, very 

 short, less than 5 mm., much darker than the context, being 

 dark-fumosous in dried specimens, mouths slightly angular, 

 2-3 to a mm., stuffed when young, edges thin, entire, rigid; 

 spores subglobose, slightly fuscous, finely asperulate, 7-8 jtt; 

 stipe subcylindric, short, central, slightly enlarged above and 

 below, harder and more rigid than the pileus, encrusted, avel- 

 laneous, pruinose, glabrous, uneven, 10 cm. long, 6 cm. thick, no 

 doubt larger in fresh specimens. 



Collected once at Bachelor's Hall, Parish of St. Thomas, 

 Jamaica, on a rotten log. 



46. GANODERMA P. Karst. 



Hymenophore large, sessile or stipitate, perennial or annual, 

 epixylous; surface sulcate, covered with reddish-brown varnish; 

 context punky, brown or pallid; tubes cylindric, concolorous; 

 spores ovoid, brown. 



Hymenophore stipitate, rarely varying to sessile. 



Stipe very long and slender, 10-15 cm. i. G. praelongum. 



Stipe short to medium. 



Surface of pileus narrowly multizonate. 



Pileus and stipe chestnut-colored context isa- 



belline. 2. G. perzonatum. 



Pileus and stipe almost black; context dark- 

 fulvous. 3. G. subfornicatum. 

 Surface of pileus not narrowly multizonate, although 



more or less sulcate. 



Pileus very large, 20-50 cm. broad. 4. G. pulverulentum. 



Pileus of medium size, not exceeding 10 cm. in 



breadth. 

 Context soon indurate, very hard ; margin of 



pileus usually lobed. 5. G. stipitatum. 



