22 



A KEY TO THE NORTH AMERICAN SPECIES OF 

 HYPHOLOMA 



By F. S. Earle 



Key to the Sections 



1. Pileus glabrous. 



Pileus more or less silky or floccose. 



2. Pileus dry, often areolate with age. 

 Pileus viscid, not hygrophanous. 



Pileus hygrophanous, changing color on drying. 



3. Pileus silky with innate fibrils. 

 Pileus floccose with separable scales. 



2. 



3- 



Sec. Fascicularia. 



Sec. Viscida. 



Sec. Appendicular^. 



Sec. Velutina. 

 Sec. Flocculosa. 



Section Fascicularia 



1. Pileus some shade of gray, rimose. 

 Pileus some shade of yellow or brown. 



2. Flesh white or whitish. 

 Flesh bright yellow. 



3. Flesh bitter, lamellae at first whitish. 

 Flesh mild, lamellae at first pale yellow. 

 Flesh mild, lamellae at first smoky blue. 



4. Pileus papillate-umbonate. 

 Pileus obtuse or subumbonate. 



H. cutifractiim Pk 

 2 



3 



4 



H. sublateritium (Schaeff. ) Sacc 



H. perplexum Pk 



H. capnoides (Fr. ) Sacc 



H. papillatum Pat 

 5 



5. Pileus dark yellowish-brown, lamellae at first sulphur-yellow then greenish. 



H. fasciculare ( Huds. ) Sacc. 

 Pileus light yellowish-brown, lamellae at first greenish then olivaceous. 



H. elaeodes (Fr. ) Sacc. 



Section VlSClDA 



I. Pileus tawny, radiately wrinkled. 



Pileus straw-yellow to pale orange, smooth. 



H. ritgocephalum Atk. 

 77. ambiattum Pk. 



Section Appendicular a 



1. Lamellae at first purplish or violet. 

 Lamellae not at first purplish or violet. 



2. Small, pileus I cm. or less. 

 Larger, pileus more than I cm. 



3. Stipe with an abruptly enlarged disc at base. 



Stipe equal, base not enlarged, blackening on drying. 



H. phyllogenum Pk 

 H. modestiim Y\ 



4. Pileus light-colored, white, pallid, alutaceous, etc. 



Pileus darker, brown or yellowish-brown, at least when moist. 



5. Pileus hemispheric, apex of stipe substriate. H. saccharinophilum Pk 



Pileus campanulate to expanded, apex of stipe subfurfuraceous. H. incertum Pk 



