29 



C. TiiK Si'KciKS OK Grifola 



1. Hymenium ochraceous, becoming dirty-yellow with age ; plants terrestrial, irregu- 



larly confluent, olivaceous to greenish-yellow. G. poripes (Fr. ) Murrill 



Hymenium white or pallid, sometimes becoming fuliginous, but never ochraceous. 



2 



2. Surface of pileus gray or grayish-brown to coffee-colored ; stipe intricately branched; 



lobes numerous and small. 3 



Surface of pileus pallid or alutaceous ; stipe not intricately branched ; lobes usually 



few in number and comparatively large. 5 



3. Pileoli centrally attached, circular and umbilicate. 



G. rainosissi»ia (Scop.) Murrill 

 Pileoli lateral, spatulate or dimidiate. 4 



4. Hymenium white, not changing color; surface of pileus gray or grayish-brown. 



G. frondosa (Dicks.) S. V. Gray 



Hymenium white, becoming fuliginous on drying or when bruised ; surface of 



pileus coffee- colored. G. Sumstind Murrill 



5. Sporophore of immense size, 20-60 cm. in diameter ; spores echinulate, 8-9 //. 



G. Berkeleyi (Fr.) Murrill 

 Sporophore 8 cm. or less in diameter; spores smooth, ovoid, much smaller. 



G.fradipes (B. & C.) Murrill 



D. The Species of Scutiger 



1. Surface of pileus uneven, squamose or rugose. 2 

 .Surface of pileus smooth, tomentose or glabrous. 4 



2. Pileus sulfur-yellow, pleuropous ; surface ornamented with imbricated floccose 



wart-like scales ; context white or yellowish ; tubes small, angular, decurrent, 

 white, becoming greenish when wounded, yellowish when dry; spores 9X6//. 



S. Ellisii (Berk.) Murrill 

 Pileus brown. 3 



3. Tubes large, 1.5 mm. or more in diameter, hexagonal ; surface of pileus smoky- 



brown ornamented with darker imbricated tufts of appressed hairs; context 



white ; stipe e.xceniric, its entire surface reticulate. 



S. retipes (Underw.) Murrill 

 Tubes small, 0.5 mm. in diameter, polygonal, decurrent, white ; pileus reddish- 

 ! brown, rugose ; stipe central, not reticulate. S. dectirrens (Underw.) Murrill 



4. Pileus light-colored : white, yellow or blue. 5 

 Pileus dark- colored : gray or brown. 7 



5. Pileus white ; context white ; tubes irregular, dissepiments thin, white ; plants 



small, growing upon grass-roots ; stipe short, dark-brown. 



S. cryptopus (Ell. & Barth. ) Murrill 

 Pileus yellow to orange, glabrous ; stipe short, concolorous ; tubes short, small, 

 1-2 X 0.2 mm., decurrent ; spores ovoid, hyaline, 4 X S"^/'- 



S. laeticolor Murrill 

 Pileus blue when fresh, changing to brown on drying. 6 



6. Tubes entire, becoming reddish-brown on drying ; context ochraceous, and pileus 



and stipe reddish-brown in herbarium specimens. 



5. caerttUoporus (Peck) Murrill 



