IO4 TROPICAL POLYPORES 



Surface of the pileus conspicuously tomentose. 



Furrows 1-2 mm. broad, 3-10 mm. deep. i. L. betulina. 



Furrows 0.5-1 mm. broad, 2-3 mm. deep. 



Furrows frequently anastomosing; edges ochraceous. 2. L. beiuliniformis. 

 Furrows rarely anastomosing; edges cremeous and 



much thinner. 3. L. subbetulina. 



Surface of the pileus finely pubescent. 4. L. cubensis. 



Surface of the pileus glabrous. 5. L. Earlei. 



i. LENZITES BETULINA (L.) Fries 



Pileus thin, coriaceous, sessile, dimidiate to flabelliform, 

 imbricate, conchate, 3-4 X 4-7 X 0.3-1 cm.; surface conspicu- 

 ously tomentose, velvety, multizonate, somewhat uneven, often 

 radiate-rugose to plicate, avellaneous with latericeous zones, 

 becoming olivaceous with age; margin thin, undulate to lobed at 

 times; context very thin, white, membranous, scarcely a mm. 

 thick; furrows slightly anastomosing when very young, 1-2 mm. 

 broad, 3-10 mm. deep, edges thin, entire to undulate, slightly 

 notched with age, cremeous within, ochroleucous to sordid- 

 ochraceous without; spores globose, smooth, hyaline, 6 p. 



Occasional on dead deciduous wood at Jalapa and in the 

 Tepeite Valley, Mexico. 



2. LENZITES BETULINIFORMIS Murrill 



Pileus thin, coriaceous to woody, sessile, dimidiate, imbricate, 

 conchate, 2-3 X 3-5 X 0.3-0.5 cm.; surface velvety-tomentose, 

 narrowly multizonate, smooth, isabelline to avellaneous, some 

 of the zones slightly darker; margin thin, fertile, rarely lobed; 

 context white, membranous, scarcely a mm. thick; furrows 

 ochraceous within, frequently anastomosing both in front and 

 behind and interrupted by pores and bifurcations, 0.5-1 mm. 

 broad, 2-3 mm. deep, edges thin, undulate to lacerate, often 

 porose. 



Found once on dead wood at Jalapa, Mexico. 



3. LENZITES SUBBETULINA Murrill 



Pileus thin, coriaceous, flexible, reniform, narrowly attached, 

 somewhat conchate, 2.5 X 4 X 0.3-0.6 cm.; surface velvety, 

 tomentose or finely hirsute, narrowly concentrically sulcate- 

 zonate, cremeous to greenish-avellaneous, the green color prob- 

 ably being due to algae, margin thin, entire or slightly undulate; 

 context thin, white; hymenium cremeous, furrows very narrow, 

 rarely anastomosing, about 0.5 mm. broad and 1.5-2.5 mm. deep; 

 edges thin, undulate to slightly lacerate, coriaceous, cremeous 

 within. 



