26 TROPICAL POLYPORES 



dry; tubes thin-walled, more or less smoke-colored, mouths 

 polygonal; spores smooth, hyaline. 



Hymenium smoke-colored when young, soon becoming black. 



Tubes black within. i. B, adusta. 



Tubes white within, the mouths black. 2. B. albostygia. 



Hymenium pallid when very young, becoming more or less 

 blackish with age. 



Pileus 5 cm. or less broad. 3. B. terebrans. 



Pileus 10-20 cm. broad. 4. B. subsimulans. 



I. BjERKANDERA ADUSTA (Willd.) P. Karst. 



Pileus cespitose-imbricate, decurrent, sometimes effused, 

 conchate, fleshy-tough or corky, somewhat flexible when dry, 

 2-4 X 4-8 X 0.2-0.4 cm.; surface undulate, indistinctly zonate, 

 especially near the margin, finely tomentose or villose, isabelline 

 with slightly darker markings; margin thin, undulate, sterile, 

 pallid, usually becoming black as though scorched; context 

 fibrous-corky, white, 1-3.5 mm. thick; tubes short, I mm. or 

 less long, smoky-white to blackish within, mouths regular, 

 angular, 5-6 to a mm., smoke-colored and pruinose when young, 

 soon becoming grayish-black, edges thin, entire; spores ellipsoid- 

 allantoid, 3-5 X 1. 5-2.5 /z. 



Common throughout on dead wood. 



2. BJERKANDERA ALBOSTYGIA (Berk. & Curt.) Murrill 



Pileus effused, resupinate to shortly reflexed, 5 mm. thick; 

 surface pallid, finely tomentose, smooth; margin obtuse, bay- 

 brown in dried specimens, entire, fertile, finely tuberculose; 

 context thin, less than I mm., white to slightly pallid, homo- 

 geneous, somewhat fragile; tubes rather long, slender, stuffed, 

 white to yellowish within, darker near the mouths, 2-3 mm. long, 

 mouths minute, somewhat angular, regular, even, 8 to a mm., 

 edges black, rather thick, obtuse, entire. 



Found once on dead wood in Cuba. 



3. BJERKANDERA TEREBRANS (Berk. & Curt.) Murrill 



Pileus subfleshy, thick, flabelliform, convex, 4 X 4-5 X I cm., 

 attached by a thick, laterally-compressed, concolorous, pubescent 

 elongation resembling a stipe; surface isabelline or luteous, 

 pubescent-scabrous, azonate, smooth; margin obtuse, entire; 

 context white to isabelline, homogeneous, soft-corky, nearly I cm. 

 thick; tubes whitish when young, fuliginous in dried specimens, 

 less than i mm., mouths 4 to a mm., edges obtuse, entire. 



Found once on dead trees in Cuba. 



