169 



Key to the Species 

 Section Squarrosae * 



1. Spores smooth. 2. 

 Spores rough. 5- 



2. Fileus umbonate, olivaceous-brown. /. dulcamara (A. & S. ) Gillet 

 Pileus obtuse. 3- 



3. Stipe with the base bluish, reddish within. /. calamistrata (Fr. ) Gillet 

 Stipe not as above. 4- 



4. Fileus uniformly pale ochraceous ; stipe concolorous. /. unicolor Peck 

 Pileus fuscous, the disk darker; stipe pallid. I. fibrillosa Peck 



5. Stipe short, 2.5 cm. X 2 mm. -^ nodulospora Peck 

 Stipe longer, 5-6 cm. /. stellatospora Peck 



Section Lacerae 



1. Spores smooth. 2. 

 Spores rough, angular, tuberculate or echinulate. 13- 



2. Flesh of stipe and pileus reddish. 3. 

 Flesh not reddish. 4. 



3. Odor strong and persistent, sweet and pleasant, like pears. 



I. pyriodora (Pers.) Gillet 



Odor not noticeable. I. lacera (Fr. ) Gillet 



4. Small, pileus less than 2.5 cm. 5- 

 Larger, pileus 2.5 cm. or more. 8. 



5. Pileus white or grayish. 6. 

 Pileus darker, some shade of brown. 7- 



6. Stipe 1-2.5 cm. X l mm. ! pileus 4-8 mm. /. comatella (Peck) Sacc. 

 Stipe 4-5 cm. X 2 ~3 mm.; pileus 1-2 cm. I. griseo-scabrosa (Peck) Earlef 



7. % Pileus obtuse; stipe 2-3 cm. X 2 mm. > odor none. /. subtomentosa Peck 



Pileus umbonate ; stipe 4 cm. X 4 mm. ; odor farinaceous, nauseous. 



I. Jlocculosa (Berk.) Sacc. 



8. Stipe conspicuously bulbous. 9- 

 Stipe equal or subequal. 10. 



9. Pileus dark brown ; lamellae distant ; spores 6X4,"- -^ tuberosa Clements 

 Pileus yellowish-brown ; lamellae subcrowded ; spores IO X & [i- 



I. Coloradoensis (Tracy & Earle) EarleJ; 



10. Lamellae adnate with a decurrent tooth. /. subdeau-rens Ell. & Ev. 

 Lamellae sinuate or adnexed. II. 



11. Stipe short, 2-3 cm., less than the diameter of the pileus. 1. tomentosa Ell. & Ev. 

 Stipe longer than the diameter of pileus, reaching 5 cm. or more. 12. 



* Some of the species included here do not fully conform to the characters of the 

 section and should perhaps be removed to Lacerae. 



\Agaricus (Hebeloma) griseo-scabrosns Peck, Reg. Rept. 26: 57. 1874. Hebe- 

 loma griseo-scabrosum Sacc. Syll. 5: 796. 1887. 



i Numerous forms occur that do not agree with either of these species. 



\ Naucoria Coloradoensis Tracy & Earle. Plant Bak. 1 : 25. 1901. 



