92 TROPICAL POLYPORES 



Stipe 2 cm. long; pileus orbicular, nodding. 2. A. nutans. 



Stipe 10 cm. long; pileus reniform, erect. 3. A. subrenalum. 



Pileus over 3 cm. broad; stipe over 5 mm. thick. 

 Stipe lateral, ascending. 



Stipe less than 5 cm. long. 



Pileus 10 cm. or more broad; tubes 5 to a mm.; plants 



cespitose. 4. A. coffeatum. 



Pileus 5 cm. or less broad; tubes 8 to a mm.; plants 



simple. 5. A. regulicolor. 



Stipe 15 cm. long. 6. A. avellaneum. 



Stipe central, erect. 



Hymenium white to avellaneous; stipe 15 cm. long. 7. A. Chaperi. 



Hymenium rich-yellow; stipe less than 10 cm. long. 8. A. flaviporum. 



Pileus 30-50 cm. broad; stipe over 5 cm. thick. 9. A. Brittonii. 



i. AMAURODERMA RENATUM (Berk.) Murrill 



Pileus lateral, very thin, rigid when dry, fan-shaped to reni- 

 form, attenuate behind, 1-2 X 1.5-3 X 0.1-0.2 cm.; surface 

 silky, zonate, slightly rugose, castaneous, becoming glabrous 

 and avellaneous-isabelline with age; margin very thin, pallid, 

 entire to undulate or lobed; context punky, bay, homogeneous, 

 0.5-1 mm. thick; tubes not stratified, though apparently reviv- 

 ing, 1-1.5 mm. long, murinous to umbrinous within, mouths 

 hexagonal, pure-white at first, becoming umbrinous with age, 

 5 to a mm., edges at first very thick, becoming thinner, entire; 

 stipe very long, erect or somewhat flexuose, laterally attached, 

 slightly expanding above, frequently branched either near the 

 middle or at the apex, avellaneous to umbrinous, opaque, finely 

 tomentose, fulvous and floccose within, 10-20 cm. long, 1-3 mm. 

 thick. 



Occasional in Nicaragua and Jamaica, usually attached to 

 buried dead wood. 



2. AMAURODERMA NUTANS (Fries) Murrill 



A small plant with slender recurved stipe, having the habit of 

 Hydnum auriscalpium; pileus corky, orbicular, convex above, 

 concave below, 2 X 2 X 0.3-0.5 cm.; surface smooth, pallid to 

 bay-black, dull-avellaneous in type specimens, abruptly sulcate, 

 radiate-rugose; margin thin, acute, pallid, entire, sterile; context 

 floccose, becoming indurate, very thin, white to avellaneous, 

 scarcely a mm. thick; tubes annual, 2-3 mm. long, pallid to 

 avellaneous within, young and but partially developed in type 

 specimens, mouths angular, minute, 8-9 to a mm., pallid to 

 avellaneous, edges thin, entire; stipe lateral, umbonate-arnxed, 

 long, slender, flexuose, twisted as though twining, recurved at the 



