64 TROPICAL POLYPORES 



Tubes visible to the unaided eye. 



Surface marked with white and light-brown zones. i. F. tennis. 



Surface variegated with dark-brown and purple zones. 2. F. variegatus. 



Tubes invisible to the unaided eye. 3. F. tenuiformis. 



i. FAVOLUS TENUIS (Hook.) Murrill 



Pileus coriaceous, reniform, conchate or applanate, narrowly 

 attached behind, 3-6 X 5-11 X 0.1-0.3 cm.; surface glabrous, 

 polished, pale-wood-colored to avellaneous-umbrinous, repeatedly 

 narrowly zonate; margin very thin, usually entire or slightly 

 undulate; context membranous, pale-isabelline, 0.5-1 mm. thick; 

 tubes very short, 1-2 mm. long, avellaneous within, mouths 

 alveolar, circular to hexagonal, exceedingly variable in size in 

 different collections, averaging 0.5-1 mm. in diameter, edges 

 rather thick, firm, entire. 



Common throughout on dead hardwood trunks and branches. 



2. FAVOLUS VARIEGATUS (Berk.) Murrill 



Pileus dimidiate to reniform, thin, coriaceous, 4-6 X 8-12 X 

 0.1-0.4 cm.; surface radiate-rugose, multizonate, velvety, be- 

 coming glabrous, chestnut-colored, variegated with chocolate- 

 brown or bay-brown tints; margin very thin, slightly paler, 

 blackening when bruised, entire to lobed; context very thin, 

 I mm. or less thick, fibrous, isabelline to umbrinous; tubes very 

 short, pale-umbrinous within, scarcely a mm. long, alveolar, 

 subcircular to hexagonal, 1-2 to a mm., edges rather thick, 

 firm, even, pallid to pale-umbrinous. 



Occasional throughout on dead wood. Abundant in some 

 parts of southern Florida, where the hymenophores often reach 

 a foot in diameter and are locally known as "spirit-cups." 



3. FAVOLUS TENUIFORMIS Murrill 



Pileus very thin, coriaceous, flexible, fan-shaped, applanate, 

 narrowly attached, 2 X 2.5 X 0.1-0.2 cm.; surface glabrous, 

 shining, zonate, slightly radiate-rugose, umbrinous to pale- 

 chestnut, margin very thin, entire, concolorous; context light- 

 fulvous, membranous, as thin as paper; tubes less than i mm. 

 long, avellaneous-umbrinous within, mouths circular, irregular, 

 6 to a mm., edges fuliginous, at first thick, becoming rather thin, 

 firm, entire. 



Collected once on dead wood in a dense jungle at Tecoman, 

 near Colima, Mexico. This species resembles Favolus tennis, 

 but has much smaller tubes, the mouths being invisible to the 

 unaided eye. 



