TROPICAL POLYPORES 91 



i. ELFVINGIA TORNATA (Pers.) Murrill 



Pileus hard, dimidiate, sessile or spuriously stipitate, applanate, 

 thin, very large, plane below, 10-20 X 15-30 X 1-5 cm.; surface 

 horny-encrusted, sulcate, glabrous, slightly tuberculose, conidia- 

 bearing, opaque to subshining, often fasciate with black bands, 

 subspadiceous to fulvous; margin smooth, sterile, often laccate, 

 subacute, often becoming truncate; context floccose with harder 

 fibers, zonate, fulvous to bay, with whitish markings in old speci- 

 mens, 5-10 mm. thick, very thin in large specimens; tubes in- 

 distinctly stratified, 5-8 mm. long each season, not separated by 

 layers of context, dark-umbrinous within, mouths circular, not 

 stuffed when young, often covered near the margin with resin, 

 4 to a mm., edges obtuse to acute, entire, pallid to umbrinous; 

 spores broadly ellipsoid, truncate, very dark yellowish -brown, 

 abundantly and roughly echinulate, 7-8 X 5-6 ju. 



Extremely common throughout the tropics on decayed logs 

 and stumps. 



2. ELFVINGIA LIONNETII (Holland) Murrill 



Pileus thin, applanate, 8-12 X 15-20 X 1-3 cm.; surface 

 horny-encrusted, profoundly radiate-rugose, zonate-fasciate, 

 tuberculose, spadiceous-umbrinous to fuliginous; margin pallid, 

 sterile, undulate, . obtuse, reddish-brown when bruised; context 

 floccose, hard, tawny-bay, 3-5 mm. thick; tubes indistinctly 

 stratified, 6-10 mm. long each season, not separated by layers 

 of context, chestnut-colored within, umbrinous-tinted, especially 

 in the older layers, mouths circular to polygonal, whitish-stuffed 

 when young, 4-5 to a mm., edges obtuse, very thin, denticulate, 

 white or cream-colored to umbrinous or bay, chestnut-colored 

 when bruised; spores ovoid, smooth, fulvous, truncate at the 

 base, 8 X 5 /*. 



Occasional on tree trunks in Nicaragua and Panama. 



45. AMAURODERMA Murrill 



Hymenophore large, epixylous, stipitate, the stipe often much 

 elongate; surface smooth, encrusted, not varnished; context 

 pallid or brown, punky to fibrous; tubes cylindric, concolorous, 

 the mouths usually light-colored at first; spores ovoid or globose, 

 brown. 



Pileus 3 cm. or less in breadth; stipe slender, less than 5 mm. 



thick. 



Context bay. i. A. renatum. 



Context white to avellaneous. 



